Dampness, or moisture, underneath your mattress is a serious cause for alarm. It can lead to serious health issues, such as mold forming and proliferating inside of your mattress, and eventually releasing mold spores into the air. The simple answer is that the moisture came from your body.Click to see full answer. In respect to this, why is my mattress wet underneath?Causes. Moisture can accumulate at the underside of your mattress because high levels of humidity. Humidity in the environment, especially when is air circulation under the bed is poor, can increase moisture under the mattress.Additionally, can a mattress get moldy? Any Mattress can Develop Mold Any type of mattress can grow mold. Whether you have an organic mattress or a memory foam one, there is a risk for mold growth. Mold grows well in mattresses because mattresses contain foam. Inside the air pockets of the mattress, mold can hide and colonize. Similarly one may ask, how do I stop damp under my mattress? Here are different ways to deal with this problem: Use a dehumidifier in the bedroom. Use an air purifier in your bedroom as air purifiers help to circulate and filter the air. Let the air circulate even if you are going to be away. Keep good airflow on the underside of the mattress. Get a mould resistant mattress. How do you keep mold out of a memory foam mattress? All of that moisture that is wicked away by cooling technology has to go somewhere. Use a breathable mattress cover. change the sheets often. don’t ever lie down out of the shower or the pool. Dry your hair before lying down. keep all damp towels and clothes off the mattress.