Hi!
It’s important to understand that simple things such as anemia or UTI could cause nausea and loss of appetite. Without knowing for sure that it is a gastroenterology/ related issue, it would be a wastage of resources to see a gastroenterologist directly e.g. this could be a thyroid issue or a malignancy; and one would end up jumping from a gastroenterologist to a primary care physician and then an endocrinologist or oncologist. Also diet changes may be beneficial for the related conditions and these may be suggested preferably post a clinical evaluation in case there is a suspicion of the conditions being related.
Regards
Welcome to the gastroenterology community! I would recommend that you get a referral to a gastroenterologist about this. I would also recommend that you try eliminating different foods from his diet, such as lactose or gluten. You can also try him on a low-fat, low-fiber, many small meals a day diet.
Hi there!
Nausea and loss of appetite are very vague symptoms which may not necessarily be related to the GI. Any systemic illness including infections, metabolic/ endocrine disorders, growths, allergies, micronutrient deficiencies, medication side effect etc. could lead to similar symptoms. It would be bet to get this evaluated by a primary care physician and depending on the cause diagnosed or suspected; it can be managed accordingly or specialist care may be sought.
Hope this helps.
Take care!