###Human: Why does weight loss occur in a patient with TB and pneumonia after an extensive phase? ###Assistant: Hello. I guess the symptoms of cough and chest pain are resolving. If she compliants with her anti koch regimen she would not be losing much weight. But it is well known that chronic illness like tb and pneumonia can cause extensive weight loss and anorexia which again add to the weight loss. You need to see a dietician for prescribed dieting to help increase your calorie intake. Multivitamin should also be taken to improve appetite. Also do a chest X-ray to see the extend of the lesion in the chest with sputum afb.