Patient presents with complaints consistent with heat intolerance.  Symptoms include excessive sweating, dizziness, lightheadedness, nausea, and weakness upon exposure to elevated temperatures or during physical exertion in warm environments.  Onset of symptoms is described as (acutegradualinsidious) and duration is reported as (duration).  Patient reports (triggering factors, exacerbating factors, relieving factors).  Past medical history includes (relevant PMH, e.g., hypothyroidism, diabetes, anemia, cardiovascular disease, medications).  Family history is (positive negative) for heat intolerance.  Physical examination reveals (e.g., flushed skin, tachycardia, tachypnea, orthostatic hypotension).  Differential diagnosis includes dehydration, heat exhaustion, heat stroke, medication side effects, and underlying medical conditions such as thyroid disorders, anemia, and autonomic dysfunction.  Assessment: Heat intolerance likely secondary to (presumed etiology).  Plan includes patient education regarding heat safety precautions, including hydration strategies, avoiding strenuous activity during peak heat hours, wearing loose-fitting, light-colored clothing, and recognizing early warning signs of heat illness.  Laboratory studies ordered (e.g., complete blood count, basic metabolic panel, thyroid function tests) to rule out contributing medical conditions.  Follow-up scheduled in (timeframe) to assess symptom improvement and review laboratory results.  Patient advised to seek immediate medical attention if symptoms worsen or signs of heat exhaustion or heat stroke develop.  ICD-10 code: (appropriate code based on etiology, e.g., R68.82 Other specified general symptoms and signs).