Doses of up to 400 IU per day are generally considered safe. A perpetual cycle of changing moods could signal the onset of bipolar disorder, a condition previously termed manic-depressive illness. The average age for the onset of bipolar disorder is 30 years, with many patients experiencing their first manic or depressive episode before the age of 20. While its cause is unknown, bipo-lar disorder is suspected to be the result of a complex mixture of biochemical and genetic factors, triggered by environmental changes such as the breakup of a relationship or a promotion. Like many psychiatric illnesses, the disorder exists in many forms and degrees.
Drug therapy can stabilize moods in almost all people with bipolar disorder, even severe forms.
If you suspect you suffer from the condition, ask your doctor whether medication is needed. Consult your doctor for treatment, as the symptoms can progress to a weakened grip and severe pain in the forearm and shoulder if left untreated. Avoid scratching and take a cool bath or shower to curb the itch. A nonprescription antihistamine should also provide relief. If symptoms continue beyond one week, see your doctor.