Potential Risks and Side Effects
While capsaicin is usually safe to eat, it can cause side effects in some cases. This is especially true if you take it in large amounts or very concentrated forms. Most side effects are mild and don't last long. They often include stomach issues or skin irritation.
People with certain conditions, like those who often have heartburn or have sensitive skin, should be careful. It's a good idea to know the risks and take precautions. Start with small amounts and then slowly increase how much you take. This approach can help reduce the chance of side effects.
Skin Irritation and Allergic Reactions
The most common side effect of topical capsaicin is skin irritation. This is often felt as a burning, stinging, or itching sensation where it is applied. This reaction is normal and usually gets better with regular use. This happens because the nerve endings become less sensitive.
However, some people may have more serious skin reactions. Symptoms can include redness, swelling, or blistering. These signs may mean they are allergic to capsaicin. If this occurs, it is best to stop using the product and talk to a healthcare professional.
Additionally, capsaicin can irritate mucous membranes. These membranes are located in the nose, mouth, and eyes. If capsaicin gets into these areas by accident, it can cause discomfort, burning, and swelling. So, it is important to be careful when using capsaicin products. This is especially true for hot peppers and strong types like pepper spray. Avoid touching your face after using them.
Digestive Issues and Precautions
While capsaicin is mostly safe to eat, having a lot of it can cause stomach problems for some people. The common side effects are heartburn, indigestion, abdominal pain, and diarrhea.

These issues happen because capsaicin can increase the release of substance P. This substance helps send pain signals and can also affect how the stomach and intestines work. When it is overactive, it can make the stomach produce more acid and cause the intestines to move more, leading to these symptoms.
To avoid stomach problems, it's best to eat foods with capsaicin in small amounts, especially if you are trying them for the first time. Start small and slowly eat more as your body gets used to it. Also, people who already have stomach issues, like gastritis, irritable bowel syndrome (IBS), or ulcers, should be careful. They should talk to their doctor before adding capsaicin-rich foods to their diet.