Dec 3, 2024 · Caffeine Overdose A caffeine overdose happens when you ingest more caffeine than your body can safely process. It can cause serious symptoms and be fatal (even though that’s rare). Call …

Sep 5, 2025 · Too much caffeine can cause unwanted side effects. High intake or sudden withdrawal may lead to headaches, anxiety, irritability, or trouble sleeping, especially in sensitive individuals.

Jan 13, 2025 · Caffeine can have impressive health benefits, but high doses can also lead to unpleasant side effects. Here are 9 side effects of too much caffeine.

Aug 12, 2025 · “Light to moderate caffeine intake can provide some health benefits for many people, but too much can cause unwanted physical and psychological effects,” says Bennett Shenker, MD, Chief …

Feb 21, 2025 · How much is too much? Up to 400 milligrams (mg) of caffeine a day seems safe for most adults. That's about the amount of caffeine in four cups of brewed coffee, 10 cans of cola or two …

The caffeine that was working for you this morning is now working against you. Here’s what you need to know and what you can do to feel better.

Jul 24, 2025 · Caffeine can be part of a healthy diet for most people, but too much may pose a danger to your health. Four physicians share what to keep in mind.

According to medical experts, including here at the FDA, caffeine can be part of a healthy diet for most people, but too much of it can have negative effects and large amounts may pose a danger to...

Aug 5, 2025 · Adults can have up to 400 milligrams of caffeine per day. More than four cups of coffee daily may be too much and can cause headaches, insomnia, and irritability.

How much caffeine is too much? Most adults can consume about 400 milligrams of caffeine per day without negative effects, the Food and Drug Administration (FDA) writes.