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He needs to get a few tests done like PCR which is expensive but will confirm presence or absence of Tuberculosis
. Also since there is weight loss
it is better to get started on Anti-tubercular treatment anyway and there will be relief. Patient needs to eat protein rich food like cereals, oats, pulses, eggs, chicken, lean meat. Drink enough water 1-2 litres a day. Patient can be started on Government ATT therapy by RNTCP approved Doctor at a Hospital. Do not delay. Better to be safe than sorry later.