I was on Naproxen for years and never had ulcers but everyone is different. would be worth having your blood checked for iron deficiency sometimes if you are low on iron you can take ulcers ..

It’s also your immune system

I have had a problem with mouth ulcers for years. To many nuts will do it. I take 1 L-Lysine 500 Mg. per day. Works

Yes I so I have luttle blisters that come up in my mouth. Hurts so bad to drink water. I take nystatin every day. But it don't help I started doing it real bad last year. After I STARTED REMICAIDE and TAKING naproxen for headaches. Which it helps but I don't take it every time. I try to get my mouth cleared of this YUCK. But NOW it's creapping to the outside OF my mouth. But sometimes I Will wash out my mouth with a little dilutes Apple vinegar. I think it helps but it just want go away. I haven't worn my dentures in a year.

Do you take methotrexate because that can cause mouth ulcers