OPINION
delivered the
opinion of the court, in which
The employee in this workers’ compensation case suffered a spontaneous and large right-lung pneumothorax while at work. The pneumothorax required two corrective surgeries and resulted in treatment with narcotics for chronic pain. After a careful review of the record, we conclude that the injury sustained was an accidental injury arising out of and in the course of her employment. We further hold that the evidence supports the trial court’s finding that the employee was totally and permanently disabled. We affirm the trial court’s judgment and remand for further proceedings consistent with this opinion.
Connie Fritts was thirty-nine years old at the time of trial. She completed еight years of education and has no special job training or skills. Her employment history includes working as a presser and clipper in a sewing factory, as a cashier, and as a tobacco cutter. She also has performed odd jobs such as cleaning houses and mowing yards. In 1998, Mrs. Fritts was employed by Athens Furniture (“Athens”) where she worked in the roll-coat room рerforming tasks such as hand-sanding, spraying varnish, and operating the wide belt and buffer. Mrs. Fritts was a long-time smoker and had pre-existing bronchitis and chronic obstructive pulmonary disease (“COPD”). She experienced a small left-lung pneumothorax 1 in 1993 and again in 1995, both of which healed without surgical treatment. On September 15, 2000, Mrs. Fritts suffered a large, right-lung pneumothorax while working at Athens. At the time of her injury, Mrs. Fritts was in good health and had no limitations on her work or personal activities. The defendant, Safety National Casualty Corporation (“Safety National”), was the workers’ compensation insurer for Athens in 2000. The plant closed in 2001.
On the day of the injury, Mrs. Fritts was spraying varnish in the roll-coat room. Mrs. Fritts and her co-worker, Barbara Tuttle, testified that the room was unusually dusty, with sawdust, fumes, and varnish spray in the air. Ms. Tuttle and Misty Hamilton were working with Mrs. Fritts when she bent over and began to cough. Mrs. Fritts testified that the fumes and dust caused her to start “coughing real bad,” that she could not breathe, and that the “whole right side” of her chest was hurting. Her husband, Bennie Fritts, and the “lead person,” Roger Dale Williams, took Mrs. Fritts outdoors. Mr. Fritts and Mr. Williams then notified Ronnie Kennedy, a supervisor, of the сoughing incident.
Mrs. Fritts continued to experience severe pain and breathing difficulties. During an emergency room visit on September 17, 2000, she was diagnosed with a large right-lung pneumothorax, and a chest tube was inserted. The chest tube, however, failed to keep her lung properly inflated. On September 26, 2000, a surgical procedure was performed to reattach her lung to the chest wall. This procedure resulted *677 in granulomatous pleurisy and scarring, causing severe pain and continued breathing problems. Mrs. Fritts underwent a second surgery in March 2001 to keep her right lung inflated and to repair the damage from the first surgery. Mrs. Fritts continued to suffer chronic pain and breathing difficulties. She was prescribed two narcotic drugs, OxyContin and Endo-cet, and a non-narcotic pain medication, Neurontin, all of which she was using at the time of trial.
Three physicians testified by deposition. Although portions of their testimony conflicted, all three physicians agreed that Mrs. Fritts was predisposed to a pneumo-thorax due to her COPD and- earlier pneu-mothoraxes and that smoking was an underlying factor in causing her 2000 right-lung collapse. Dr. Charles Cox testified that the coughing episode could have caused the pneumothorax. Dr. William Bailey testified that the work environment led to the coughing that caused the pneu-mothorax. Dr. John McElligott testified that the pneumothorax was not related to her work and was caused by smoking.
The trial court credited the testimony of Dr. Cox and Dr. Bаiley and found that Mrs. Fritts suffered a compensable injury by accident arising out of and in the course of her employment. The trial court ruled that Mrs. Fritts developed pleurisy as a complication and result of her injury, that she is permanently and totally disabled, and that the employer had proper notice of the injury. 2
The insurer appealed, arguing that the injury was not causally related to the employment. The insurer also contends that the trial court should have analyzed this case as an occupational disease rather than as an injury by accident and that the evidence was insufficient to support a finding of total and permanent disability. The case was referred to the Special Workers’ Compensation Appeals Panel (“Panel”) pursuant to Tennessee Code Annotated section 50 — 6—225(e)(3) (Supp.2003). The Panel reversed and dismissed, finding that the employee was suffering from a pre-existing disease caused primarily by smoking, that there was no anatomical or physiological change in her pre-existing condition, and that under the occupational disеase statute the employee’s condition did not “.originate and arise out of’ her employment. We granted full court review.
I. Compensable Injury
To be compensable, an injury or occupational disease must arise out of and in the course of employment and cause either disablement or death. Tenn.Code Ann. § 50-6-102(12) (1999). The phrase “in the course of’ refers to the time, place, and circumstances of the injury, and “arising out of’ refers to its cause or
origin. Hill v. Eagle Bend Mfg., Inc.,
A. Course of Employment
Mrs. Fritts, Ms. Tuttle, and Ms. Hamilton testified they were working in the rolhcoat room when Mrs. Fritts had a “bad” coughing episode followed immediately by pain in her right chest and breathing problems. Ronniе Kennedy, a former lead person and supervisor at Athens, testified that he was present during Mrs. Fritts’ shift on September 15, 2000, but denied being told that Mrs. Fritts had a coughing spell at work. Mr. Kennedy stated that Bennie Fritts told him the following Monday that Mrs. Fritts’ lung collapsed when she fell off the porch at home.
The trial court specifically found that Mr. Kennedy was not a credible witness and instead crеdited the testimony of Mrs. Fritts, Ms. Tuttle, Ms. Hamilton, and, inferentially, Bennie Fritts. When issues of credibility of witnesses and the weight to be given their in-court testimony are before the reviewing court, considerable deference must be accorded to the factual findings of the trial court.
Richards v. Liberty Mut. Ins. Co.,
B. Arising Out Of
To be compensable, the injury also must have its cause or origin in the workplace. Tenn.Code Ann. § 50-6-102(12) (1999). An accidental injury arisеs out of employment when there is a causal connection between the working conditions and the resulting injury.
Phillips v. A & H Constr. Co.,
In most cases of work-related injury, causation must be established by expert medical evidence.
Tindall v. Waring Park Ass’n,
All three physicians testified that smoking and COPD were underlying causes of the pneumothorax. Dr. Cox, a surgeon who treated Mrs. Fritts in the emergency *679 room in 1993 and 2000, explained that smoking tends to cause the development of emphysematous changes in the lungs so that “blebs” near the surface of the lung develop. These blebs may burst, causing a pneumothorax. Based upon Mrs. Fritts’ mеdical history, Dr. Cox testified that a coughing episode would have been a contributing factor and could have caused the pneumothorax. He also' stated that particulate matter or anything that causes irritation or coughing could have contributed to the pneumothorax.
Dr. Bailey practices physical medicine and rehabilitation and treats intractable chronic pain. He examined Mrs. Fritts and reviewed her records. Dr. Bailey testified that a lung can collapse from trauma such as coughing and that Mrs. Fritts’ coughing episode caused the right-lung pneumothorax by jarring “the lung away from the [chest] wall.” He testified that the coughing episode was directly related to Mrs. Fritts’ work environment.
Dr. McElligott is an occuрational health physician who saw Mrs. Fritts on a referral from Safety National’s attorney and reviewed her medical records. In his opinion, her present condition was not work-related and was due solely to her smoking and prior pneumothoraxes. He believed that coughing could not have caused the 2000 pneumothorax. He stated that Mrs. Fritts “could be sitting at home picking her nose, she’s going to have another pneumothorax” and that she just happened to be at work when this one occurred. In his opinion, a spontaneous pneumothorax can occur without a cough, and a cough is not usually a causative factor. The trial court commented on Dr. McElligott’s possible bias and inapproрriate testimony and stated that it “gave much greater weight” to the testimony of Dr. Bailey and Dr. Cox.
The record amply supports the trial comet’s findings of fact, which largely depended upon its findings of credibility. The court’s factual findings are entitled to considerable • deference.
Richards,
We are also unpersuaded that Mrs. Fritts’ pre-existing bronchitis and COPD bar recovery in this case. An employer takes an employee as she is along with the risk of having an employee’s weakened condition aggravated by an injury that might not harm a normal, healthy person.
Hill,
*680
We are similarly unpersuaded by Safety National’s argument that this case should be decided under the occupational disease statute in the Workers’ Compensation Act because Mrs. Fritts suffered from a preexisting lung disease causеd by smoking.
See
TenmCode Ann. § 50-6-301(6) (1999) (stating that “[diseases of the heart, lung, and hypertension arising out of and in the course of any type of employment shall be deemed to be occupational diseases”). Interpreting this statute, this Court has held that an occupational disease is one that commonly occurs to persons engaged in a particular occuрation, such as a painter affected by exposure to lead.
Brown Shoe Co. v. Reed,
In contrast, “accident” as it applies to the Workers’ Compensation Act is a mishap or event that is unexpected, cannot reasonably be anticipated, ■ and is “produced by unusual combinations of fortuitous circumstances.”
Id.
at 69. An “injury” includes a change in any part of a person’s system that produces harm or pain or lessens the natural use or capabili-' ty of the body.
See id.
at 68. The Workers’ Compensation Act provides compensation for the accidental result.
Fink v. Caudle,
The fact that “diseases of the heart, lung and hypertension” are listed as “occupational diseases” in Tennessee Code Annotated section 50-6-301(6) dоes not turn all injuries to the heart and lung into occupational diseases. This Court has recognized that a heart attack may be an injury by accident when it is causally related to employment, even if the employee was suffering from pre-existing heart disease and even if the heart attack was caused only by the ordinary exertion of the work.
See Clark,
Mrs. Fritts suffered a compensable injury on September 15, 2000, when her work environment caused a coughing spell that precipitated her pneumothorax. The evidence does not preponderate against the trial court’s finding that Mrs. Fritts’ injury arose out of her employment with Athens.
II. Vocational Disability
The trial court should consider both lay and expert testimony in determining the extent of an employee’s disability and is not bound to accept a physician’s opinion in this regard.
Hinson,
Mrs. Fritts and several co-workers and family members testified that before the 2000 рneumothorax she led an active life working at the furniture factory, cleaning houses, taking care of. her home and family, mowing, riding horses, and fishing. After the injury she has been unable to do any of these activities. At times she cannot get out of bed or out of a chair by herself. She cannot use her arms as she once could, and she experiences more pаin when she moves. She sits “like she’s strung out all the time” and is “groggy and staggering.” Her husband testified that Mrs. Fritts is sometimes unable to keep up *681 with her medications and that he and the children must assist her. Mrs. Fritts testified that the medications make her groggy, drowsy, and unable to concentrate and that she does not drive for fear of having an accident.
Dr. Bailey limited Mrs. Fritts to light duty but stated that she should not be exposed to fumes, dust, extremes of heat, or anything that might cause coughing. She is also limited to jobs that do not require bending, reaching, or using her arms. Dr. Bailey assessed a 5% permanent partial impairment rating to the body as a whole for her chronic pain syndrome. Because of the narcotics she has been prescribed, Mrs. Fritts is “under the influence” at all times аnd should not work or drive. Dr. Bailey stated that Mrs. Fritts’ condition will require continued treatment with these or similar narcotic medications. Dr. McElligott agreed that Mrs. Fritts should not drive or work while taking the prescribed narcotic medications, although he questioned her level of pain and her need for the medications.
For permanent total disability benefits to be awarded, thе disability must prevent the employee from working at an occupation that brings the employee an income. Tenn.Code Ann. § 50-6-207(4)(B) (1999);
see also Rhodes,
III. CONCLUSION
Upon a careful review of the record, this Court concludes that the evidence does not preponderate against the trial court’s findings that Mrs. Fritts suffered an accidental injury arising out of and in the course and scope of her employment and that she is permanently and totally disabled. We affirm the trial court’s judgment and remand to the trial court for further proceedings consistent with this opinion. Costs are assessed against Safety National Casualty Corporation and its sureties, for which execution may issue if necessary.
WILLIAM M. BARKER, J., not participating.
Notes
. A pneumothorax is commonly known as a collapsed lung.
. Mrs. Fritts and her husband testified that the lead person, Roger Dale Williams, had actual notice of the incident. Mr. Fritts testified that he and Mr. Williams notified Ronnie Kennedy, a supervisor, immediately after the coughing incident. Mr. Kennedy testified that he was not a supervisor in September 2000 ánd denied any knowledge of the coughing incident. The trial court did not find Mr. Kennedy to be a credible witness and found that the employer had actual notice of the injury. The evidence does not preponderate against the trial court’s findings.
