delivered the opinion of the Court.
This сase presents the question of whether expert medical evidence is required to support a finding that an automobile accident caused medical expenses of over $1 million. We conclude that expert medical evidence is required to prove causation unless competent evidence supports a finding that the conditions in question, the causal relationship between the conditions and the accident, and the necessity of the particular medical treatments for the conditions are within the common knowledge and experience of laypersons. Because only lay evidence was offered to prove that the accident caused all the medical expenses and expert evidence was required to prove many of them, we reverse and remand to the court of appeals for further proceedings.
I. Background
On October 17, 2002, eighty-six-year-old Arturo Labao was a passenger in a car being driven by his son-in-law, Pacifico Ferrer, when a car being driven by Noemi Guevara turned in front of them. The cars collided, and both Pacifico 1 and Arturo were injured and taken to a hospital emergency room by ambulance.
After Arturo died in May 2008, suit was filed by Pacifico and Corazon Labao Ferrer, Arturo’s daughter and Pacifico’s wife, as a result of the injuries Pacifico and Arturo suffered in the accident. The only testimony at trial regarding damages came *664 from Pacifico 2 and Corazon. Their testimony was to the effect that Arturo had a seatbelt on at the time of the accident and that after the accident Arturo was screaming, complaining about a stomachache and moaning. Arturo was hospitalized. Cora-zon testified without objection that he underwent abdominal surgery on the night of the accident, then had another surgery because the first was not healing properly. No medical records from the hospitalization were introduced and no medical testimony was introduced. Medical bills admitted into evidence show that Arturo was in the hospital’s intensive care unit from October 18, 2002 until January 2, 2003, then remained in the hospital for another month. Following his discharge from the hospital in February 2003, Arturo spent approximately two more weeks in a continuing care facility. The only medical record introduced for the two-week admission was a note by a consulting physician which listed Arturo’s chief complaint upon admission as shortness of breath. The doctоr’s “History of Present Illness” noted, among other matters, the automobile wreck in which Arturo “sustained multiple orthopedic injuries and has developed bac-teremia and respiratory distress” and that he had a tracheotomy on November 13, 2002. The note also reflected that Arturo had a significant past medical history of “atrial fibrillation and hypertension as well as acute and chronic renal failure” and significant past surgical history for “ileal resection as well as cataract surgery.” No dates were given as to the conditions noted in the history. On March 6, 2003, Arturo was admitted to another medical center for two weeks. The only medical records introduced for the March admission were the attending physician’s “History and Physical” notes and a consultant’s report. Those two records reflected that Arturo came to the emergency room because of “[cjough and shortness of breath.” He was having chills and low-grade fever and his condition was wоrsening. His past medical history was noted as “complicated” and included a “long history of hypertension and atrial fibrillation,” “known history of hypertension, atherosclerotic heart disease, history of congestive heart failure,” peripheral vascular disease, chronic venous insufficiency, degenerative joint disease, and the auto accident in October 2002 and subsequent medical treatment including an “exploratory laparotomy for internal bleed.” The attеnding physician noted that, upon admission, Arturo was not having “any significant complaints except for pain in his left knee which he developed about two days ago. He has not been able to walk due to the pain.”
Medical bills which were introduced included bills for the hospital and both care facility confinements and associated expenses for items such as drugs, laboratory procedures, respiratory services, physical therapy, renal dialysis, multiple anesthesiа administrations, echo cardiograms, and “ancillary charges” of various kinds. The total expenses exceeded $1 million. Cora-zon testified that before the accident Arturo had atrial fibrillation and high blood pressure for several years but did not have medical treatment except for checkups and blood pressure medications.
At the close of evidence, Guevara moved for a directed verdict. Although she did not contend that the treatments Arturo received were unnecessary for treatment *665 of his conditions or that the charges were unreasonable in amount, she argued that there was no evidence the conditions treated were caused by the accident. Corazon argued that evidence of the sequence of treatments following the accident combined with lay testimony about the accident and Arturo’s having no abdominal problems or requiring a ventilator prior to the accident was sufficient to establish a сausal relationship. The motion for directed verdict was denied.
The jury found damages in the amount of over $1.1 million for Arturo’s medical expenses and $125,000 for his pain and mental anguish. Guevara then moved for judgment notwithstanding the verdict based in part on the same causation arguments made in her motion for directed verdict. Corazon responded in the same vein as to the motion for directed verdict. The trial court granted Guevara’s motion and entered a take-nothing judgment as to Arturo.
Corazon appealed. Citing
Morgan v. Compugraphic Corp.,
Guevara asserts that the court of appeals’ reliance on
Morgan
to support its
post hoc, ergo prompter hoc
reasoning (“after this, therefore because of this,” Black’s Law DiCtionary 1186 (7th ed.1999)) demonstrates the need for
Morgan
to be reexamined. She urges us to overrule
Morgan
to the extent it is inconsistent with the rule that expert testimony of causation is required in cases involving complex medical conditions.
See Leitch v. Hornsby,
II. Standard of Review
When reviewing a court of appeals’ judgment reversing the trial court’s grant of judgment notwithstanding the verdict, we conduct a legal sufficiency analysis of the evidence.
City of Keller v. Wilson,
III. Causation Evidence
A. General Rule
The general rule has long been that expert testimony is necessary to establish causation as to medical conditions outside the common knowledge and experience of jurors.
See, e.g., Ins. Co. of N. Am. v. Myers,
[T]he evidence shows that Morgan had always been in good health prior to returning to work from her vacation. Upon returning to her job, she worked with her face two inches from a typesetting machine which, it is admitted by default, was leaking chemical fumes. Soon after resuming her employment, that is, soon after being exposed to the fumes emanating from the typesetting machine, Morgan experienced problems with “breathing and swelling and the like.” After four or five days of being constantly exposed to these fumes during her working hours, Morgan developed symptoms such as watering of the eyes, blurred vision, headaches and swelling of the breathing passages. We bеlieve this evidence establishes a sequence of events from which the trier of fact may properly infer, without the aid of expert medical testimony, that the release of chemical fumes from the typesetting machine caused Morgan to suffer injury.
Id.
Competent proof of the relationship between the event sued upon and the injuries or conditions complained of has always been required. In Morgan, we merely applied the rule to a particular set of facts.
B. Non-Expert Evidence of Causation
In personal injury cases, trial evidence generally includes evidеnce of the pre-oc-currence condition of the injured person, circumstances surrounding the occurrence, *667 and the course of the injured person’s physical condition and progress after the occurrence. The record before us contains lay testimony about Arturo’s pre-accident physical condition, his activities and other events leading up to the accident, the accident, an investigating police officer’s report, and post-accident events including medical treatments. This type of evidence “establishing a sequence of events which provides a strong, logically traceable connection between the event and the condition” could suffice to support a causation finding between the automobile accident and basic physical conditions which (1) are within the common knowledge and experience of laypersons, (2) did not exist before the accident, (3) appеared after and close in time to the accident, and (4) are within the common knowledge and experience of laypersons, caused by automobile accidents. For example, if Arturo had been pulled from a damaged automobile with overt injuries such as broken bones or lacerations, and undisputed evidence which reasonable jurors could not disbelieve showed that he did not have such injuries before the accident, then the physical conditions and сausal relationship between the accident and the conditions would ordinarily be within the general experience and common knowledge of laypersons'. Thus, it would be within the general experience and common knowledge of laypersons that the accident caused Arturo to be transported to a medical care facility and to be cared for medically to some degree. To this extent, we do not understand Guevara to disagree with Morgan.
Cases decided after
Morgan
have expounded upon the circumstances in which competent expert testimony is required to prove the nature of and causal connection between physical conditions and an occurrence. The holdings of such cases in many instances reflect advances in science and medicine. Even so, such cases reflect the basic premise affirmed in
Morgan:
competent evidence is required to prove the existence and nature of a condition and a causal relationship to the event sued on even though, in limited circumstances, the existence and nature of certain basic conditions, proof of a logical sequence of events, and temporal proximity between an occurrence and the conditions can be sufficient to support a jury finding of causation without expert evidence.
See Daubert v. Merrell Dow Pharms., Inc.,
Undoubtedly, the causal connection between some events and conditions of a basic nature (and treatment for such conditions) are within a layperson’s general experience and common sense. This conclusion accords with human experience, our prior cases, and the law in other states where courts have held that causation as to certain types of pain, bone fractures, and similar basic conditions following an automobile collision can be within the common experience of lay jurors.
See Burandt v. Clarke,
C. Application
The jury awarded damages for Arturo’s treatments which included, among other expenses, the cost of (1) at least two abdominal surgeries; (2) three separate confinements in health care facilities, one of which was for over three months; (3) a great variety and quantity of various pharmaceutical supplies, medicines, and drugs; (4) numerous varied laboratory procedures; (5) extensive treatments for respiratory failure and therapy; (6) physical therаpy of various kinds; (7) treatments for kidney failure; and (8) a great assortment and quantity of “central supply” and miscellaneous medical charges. Corazon maintains that a legally sufficient causal link was established as to all the conditions and treatments for them even though no expert evidence provided such a link. We disagree.
The evidence does not specify the conditions for which Arturo was treated in the hospital except by medical history set out in records for thе subsequent care facility admissions. Those histories do not purport to be diagnoses of Arturo’s previously treated conditions nor to relate his conditions to the accident. Some of the conditions for which Arturo was treated could be speculated about by reviewing entries on the bills for medical care, but the bills do not specify the conditions treated. For example, the bills set out dates and charges for respiration therapy, but they give no condition for which the therapy was given, do not specify the type of therapy, or give any indication of who ordered the therapy or why. The bills generally name the medications given, but do not set out the condition treated by the medications or the intended effect of the medicines. Patients in hospitals are often treated for more than one condition brought on by causes independent of each other.
See Texarkana Mem’l Hosp., Inc. v. Murdock,
Arturo’s medical course clearly was not smooth or simple. Affidavits proving up the medical bills are evidence that expenses were reasonable in amount and necessary for treatment of Arturo’s conditions, but the bills are not evidence of what all the conditions were nor that all the conditions were caused by the accident. See Tex. Civ. PRAo. & Rem.Code § 18.001 (providing that “an affidavit that the amount a person charged for a service was reasonable at the time and place that the service was provided and that the service was necessary is sufficient evidence to support a finding of fact by judge or jury that the amount charged was reasonable or that the service was necessary”). Nor do the few medical records for admission and consultation by physicians several months after the accident provide the causal link. 4
Non-expert evidence оf circumstances surrounding the accident and Arturo’s complaints is sufficient to allow a layperson of common knowledge and experience to determine that Arturo’s immediate post-accident condition which resulted in his being transported to an emergency room and examined in the emergency room were causally related to the accident. Thus, the evidence is legally sufficient to support a finding that some of his medical expenses were causally related to the accident. On the other hand, the evidence is *670 not legally sufficient to prove what the conditions were that generated all the medical expenses or that the accident caused all of the conditions and the expenses for their treatment.
III. Disposition
Because the evidence is legally insufficient to support a finding that the car accident caused all of the medical expenses awarded by the jury, we reverse the court of appeals’ judgment. Generally we render judgment when a no evidence issue is sustained following a trial on the merits.
See Murdock,
Notes
. We refer to the parties by their first names to avoid confusion.
. Pacifico testified that the accident caused him to have slight pain in his neck and hand and he was “just kind of shook up.” He was examined and x-rayed in the emergency room, then relеased. He had a follow-up x-ray examination and was treated by a chiropractor for a few weeks but was "fine” when he testified at trial. Neither Pacifico nor Guevara appealed from the judgment in Pacifico’s favor.
. Considering federal precedent as to eviden-tiary matters is appropriate.
See Gammill v. Jack Williams Chevrolet, Inc.,
. The physician histories were neither entirely consistent with each other nor with Corazon’s testimony as to Arturo's condition before the accident.
See Crye,
