g., enlarged prostate, urethral stricture),
alcohol use, drug dependency, heart problems (e.g., slow/irregular heartbeat, very low blood pressure), abdominal/stomach problems (e.g., gallbladder disease), lung disease (e.g., asthma, chronic obstructive pulmonary disease), seizure disorders, serious head injury or brain disease, spinal problems (kyphoscoliosis), low thyroid disease (hypothyroidism), adrenal gland problems (Addison's disease), psychiatric problems (toxic psychosis).