People with lax joints are predisposed to many different kinds of headaches. Migraine headaches are very common, in part because many migraines are triggered by fluctuations in hormone levels or blood pressure, which can be increased by autonomic problems. Headaches from chronic neck strain also are very common and can often turn into migraines. In addition, severe autonomic problems can cause a dehydration or “hangover”-like headache, possibly related to inadequate blood flow. Uncommonly, looseness of the muscles that control the eyes can cause difficulty focusing and eye strain headaches. TMJ problems can also cause headache.