Weight loss, nervousness, and tachycardia-rationale: weight loss, nervousness, and tachycardiaare signs of hyperthyroidism. other signs of hyperthyroidism include exophthalmos, diaphoresis, fever, and diarrhea. weight gain, constipation,lethargy, decreased sweating, and cold intolerance are signs of hypothyroidism.client needs category: physiological integrityclient needs subcategory: physiological adaptationcognitive level: comprehensionreference: smeltzer, s.c., et al. brunner and suddarths textbook of medical surgical-nursing,11th ed. philadelphia: lippincott williams & wilkins, 2008, p. 1459.