A thyroid crisis is a serious condition requiring immediate medical intervention, typically manifesting with the following symptoms: fever of 38°C (100.4°F) and above, tachycardia (pronounced heart palpitations exceeding 140 beats per minute), excessive sweating, diarrhea and vomiting, severe abdominal pain, extreme irritability or agitation, loss of consciousness (syncope), and sleep disturbances. Diagnosis is made by an endocrinologist's examination and blood tests. These tests typically show high T3 and T4 levels and low TSH hormone. A thyroid ultrasound may also be required to confirm the diagnosis. The first step in the treatment of thyroid diseases and thyroid crisis is thyroid medication. Correct and regular use of these medications alleviates the patient's symptoms and reduces the effects of the disease. Following medication therapy, radioactive iodine treatment or surgical intervention options are evaluated under medical supervision.