A major symptom of endometriosis is recurring pelvic pain. Pain is the most common presenting symptom. Chronic hypotension rarely exists as more than a symptom. It may occur as an isolated symptom without headache in acephalgic migraine. A chronic cough is often the first symptom to develop. Insomnia is a common symptom of these. Anorexia is a symptom, not a diagnosis. Diarrhea is a common symptom, some experience constipation. Constipation is a symptom, not a disease. Confabulation is one salient symptom of this syndrome. The most common neurological symptom includes seizures. The main symptom of schwannomatosis is localized pain. Headaches are the most common mTBI symptom. Treatment depends on diagnosing the specific pathology causing this symptom. A second prominent symptom of narcolepsy is abnormal REM sleep.