8. Unintentional weight loss
In an obese prone world full of calories and junk food, weight loss is often celebrated. It can be a great achievement and it can be excellent for your appearance and health. However, if you lose more than ten pounds without changes to your exercise routine or diet, you need to see a doctor.
Changes to your appetite and unintentional weight loss can be a sign of many cancers. This especially happens with lung, stomach, pancreatic and esophageal cancer. Weight loss is also a common sign of leukemia and lymphoma.