info for my knoweledge.... sudden weight gain and loss - Page 1

Can anyone list me names diseases that;

1) suddenly weight gain

2) suddenly weight loss

so i can read about them?.

Most common problem would likely be thyroid problems for both excessive weight gain and weight loss, depending on whether thyroid is high or low. 

Any disease causing diarrhea or loose stool, such as EPI or other pancreatic problem or some malabsorption problem would cause weight loss.

Kidney diseases can cause weight loss.

Tick borne diseases cause weight loss.

Liver failure

Leptospirosis

Parathyroid problems *(hyper and hypo parathyroid)

Cancers cause weight loss often.

Any disease or health issue that causes loss of appetite.

These will keep you busy for some time, but there are other possibilities as well.