Unwanted summertime guests can be more dangerous than they look. The so-called “kissing bugs” — small, flat insects that bite people while they sleep — are now appearing in more areas, and experts warn their bite can be far from harmless.

Kissing bugs, also known as triatomine bugs, feed on blood and are often found in warm, humid regions. They get their name because they tend to bite around the lips or eyes at night. But the real danger isn’t the bite — it’s what they can leave behind.

These bugs can carry a parasite called Trypanosoma cruzi, which causes Chagas disease — a condition that may quietly damage the heart, digestive system, and nerves over years.

At first, symptoms may seem mild: fatigue, swelling near the eyes, fever, or a rash. But if ignored, Chagas can lead to severe heart complications and even sudden cardiac failure years later.

If you ever get bitten, wash the area with soap and water immediately, avoid scratching, and see a doctor. If you can, safely capture the insect in a plastic bag for identification.

To protect yourself, seal any gaps in walls or windows, keep outdoor lights off at night, and make sure pets sleep indoors.

Kissing bugs might look like any other summer insect, but their bite can change your life. Knowing what to watch for can make all the difference.