Almost anything severe enough to keep you from doing your regular work. Some of the most common we see are:

Spinal disorders, including herniated cervical and lumbar discs, spinal stenosis, arthritis, osteoporosis, compression fractures;

Rheumatoid arthritis, lupus, fybromyalgia, chronic fatigue syndrome, HIV, AIDS; Amputations, multiple fractures requiring surgery, reflex sympathetic dystrophy, chronic regional pain disorder;

Decreased vision or hearing, vertigo, tinnitus, stuttering; Asthma, emphysema, asbestosis, sleep apnea, chronic obstructive pulmonary disease;

Heart attacks, angina, bypass surgery, congestive heart failure, enlarged heart, aneurysm, valve disease, heart transplant;

Chronic liver disease, cirrhosis, hepatitis, ascites, colitis, Crohn's disease, diverticulosis, pancreatitis;

Kidney disease, anemia, leukemia, polycithemia, lymphoma, myeloma, sickle cell anemia;

Sklerodema, burns, psoriasis, atopic dermatitis, melanoma, hydradenitis, skin cancer;

Diabetes, obesity, neuropathy, retinopathy, thyroid diseases, peripheral vascular disease, high blood pressure;

Seizure disorder (epilepsy), multiple sclerosis, Parkinson's disease, myasthenia gravis, brain tumor, ALS, Alzheimer's;

Depression, anxiety, bi-polar disorder, post-traumatic stress disorder (PTSD), ADHD, ADD, schizophrenia;

Substance abuse, alcoholism, prescription pain addiction, personality disorders, mood disorders;

Cancer (breast, bone, lung, abdominal, liver, pancreatic, testicle, ovarian, colon, skin, mouth, prostate, kidney).