Naproxen Side Effects: What You Need to Know Before Taking It

When you take naproxen, a nonsteroidal anti-inflammatory drug (NSAID) used for pain, swelling, and fever. Also known as Aleve, it's one of the most common over-the-counter pain relievers in Canada and the U.S. But while it works fast for headaches, menstrual cramps, or arthritis, it doesn’t come without risks. Many people assume because it’s available without a prescription, it’s harmless. That’s not true. Naproxen can cause serious problems — especially if you take it long-term or have other health conditions.

The biggest concern with naproxen is your stomach. It can cause ulcers, bleeding, or perforations — sometimes without warning. If you’ve ever had a stomach ulcer, or if you’re over 60, take blood thinners, or drink alcohol regularly, your risk goes up. It’s not just about heartburn. You might feel fine until you start vomiting blood or notice black, tarry stools. That’s not normal. It’s a red flag. Naproxen also affects your kidneys, especially if you’re dehydrated or already have kidney disease. And if you have high blood pressure or heart disease, naproxen can make it worse. Studies show it raises the risk of heart attack and stroke, even in people who’ve never had them before. This isn’t theoretical. The FDA has warned about this for years.

Then there’s the silent side effects — dizziness, ringing in the ears, swelling in your legs, or sudden weight gain. These aren’t just "annoyances." They can mean your body is struggling with fluid retention or early kidney stress. If you’re taking naproxen daily for back pain or arthritis, you’re not just treating pain — you’re exposing yourself to a slow-building risk. And because it’s so common, many people don’t realize they’re in danger until it’s too late.

What you’ll find below are real, practical posts that dig into what naproxen does to your body, how it interacts with other medications like blood pressure drugs or antidepressants, and how to spot trouble before it becomes an emergency. You’ll see how people have managed these risks, what alternatives exist, and why checking in with your doctor isn’t optional — it’s essential. This isn’t about scaring you. It’s about giving you the facts so you can decide if naproxen is still the right choice for you.