Hi Dear , Welcome to HCM. Understanding your concern. As per your query family member of yours had loss of taste and also feeling feverish which could be due side effects of certain medicines like such as Topiramate sinusitis , oral infection or nerve dysfunction like glossopharyngeal . I would suggest you to visit neurologist once and take medications which lower down autoimmune or nervous system disorder. Doctor may prescribe anti inflammatory to reduce inflammation in nerve . Give them diet rich in zinc supplements as that will recover there taste. Maintain a proper dental hygiene to prevent gingivitis or stomatitis. Avoid smoking if you are habitual. I would advice use of oral corticosteroids as well because if its due to any allergy it will resume back taste. If condition doesn t get well then consult dentist for dental infection and oral prophylaxis . Hope your concern has been resolved. Get Well Soon. Best Wishes, Dr. Harry Maheshwari