Intermittent Lightheadedness, Nausea, and Hot Flashes: Possible Causes

These episodic symptoms suggest autonomic or hormonal fluctuations. Common causes:

• Vasovagal syncope: Triggered by standing, stress, dehydration → hypotension, bradycardia.
• Hypoglycemia: Low glucose → adrenergic symptoms (sweating, tremor) + neuroglycopenic (confusion).
• Hyperthyroidism: Excess thyroid hormone → tachycardia, heat intolerance, weight loss.
• Menopause/perimenopause: Estrogen withdrawal → hot flashes, autonomic instability.
• Anxiety/panic attacks: Hyperventilation, catecholamine surge.
• Medication side effects: Antihypertensives, antidepressants, hormonal contraceptives.

Next Steps

Keep a symptom diary (timing, triggers, duration). See a clinician for history, vitals, labs (glucose, TSH, electrolytes, CBC), and possible tilt‑table or Holter monitoring.