Do stomach ulcers go away on their own? especially if they don't cause many symptoms? if so how long

They can: Prior to Prilosec and zantac, some ulcers would heal on their own. However it normally takes 6 to 8 weeks. Some ulcers are cause by bacteria and others are caused by medications like motrin. We can eliminate bacteria, h.Pylori, with antibiotics. By reducing acidity with medicines like Nexium (esomeprazole) and Prilosec the body can heal these ulcers.