27 years old boy is losing weight what is wrong?

Please see Dr.: There can be many reasons for weight loss. The Dr. can evaluate and see if there is a problem.

Weight: First, is he trying to lose weight? If not, many things could cause weight loss. Hyperthyroidism, inflammatory bowel disease like Crohn's Disease or ulcerative colitis, celiac disease, diabetes, infections, etc. Don't forget medications or drug abuse. I would strongly encourage him to get a full physical to address thoroughly.

Much more: information is needed and is best obtained by a face to face meeting with a physician who can get a complete history, examine and order diagnostics if needed. That is the best avenue to follow if it is an important concern.

Many possibilities: Unfortunately not enough information to make a good educated guess. There can be many reasons for losing weight. It could be on purpose or pt not eating enough calories. there could be a medical issue like an inflammatory bowel condition, celiac. or even some malignancy. It could be an endocrine reason, like hyperthyroidism. Please see physician so they can start trying to figure out why.

Evaluation : Any involuntary weight loss should be evaluated. Please schedule appointment with your physician.