Unable to gain weight is a common problem.
But it has many causes. Those causes need to be ruled out and if present have to be treated accordingly
Majority of the times there is no specific cause but just a HIGH METABOLIC RATE by default.
Next Steps
a good planned excercises, along with correct diet is the only way to gain weight.
Answered2019-04-07 14:59:17
Let others know if this answer was helpful