Do I need an endoscopy to see if I have ulcers, or can I just take meds for ulcer symptoms?

Know what u Rx. C MD. Short term rx without evaluation may be ok (see the disclaimer on Prilosec otc-do not use for more than 2 weeks without seeing md-for evaluation). That's because the meds may relieve or mask symptoms of more serious issues, like ulcers, or cancers. Ulcers usually due to bact infection. Rx is to treat infection, not just take acid reducer. Ulcers can bleed, perforate, or can be ulcerated ca. C md.