Yes, it is possible for people who are considered "normal" without any preexisting mental health issues to experience a manic episode without having a mental disorder. In such cases, the manic episode might be triggered by external factors like sleep deprivation, excessive stress, drug use, or medication side effects. These situations are often referred to as "secondary mania" or "manic episodes due to a medical condition or substance."
For a diagnosis of bipolar disorder, which is the primary mental disorder associated with manic episodes, the occurrence of manic episodes must be recurrent and not solely related to external triggers. People with bipolar disorder experience periods of mania alternating with periods of depression or, in some cases, hypomania alternating with depression.
It's essential to differentiate between a standalone manic episode caused by external factors and a recurring pattern of manic episodes indicative of a bipolar disorder. If someone experiences a manic episode without any history of bipolar disorder or other mental health issues, it is crucial to consider potential external triggers and assess the individual's overall mental health. If such episodes recur or lead to significant impairment in daily functioning, a thorough evaluation by a mental health professional is recommended.