Does mono have any complications?
Sometimes. The main complication with mono is the enlargement of the spleen. The spleen is like a large gland. It's located in the upper part of your abdomen on the left side. It helps filter your blood. In severe cases of mono, the spleen can rupture (tear open).
Although a ruptured spleen is rare in people who have mono, it's wise to be aware of the signs and call your doctor right away if you notice any of them. Signs of a ruptured spleen include sharp pain in the left upper part of your abdomen (under the left chest), feeling lightheaded, feeling confused, blurred vision and fainting.
Written by familydoctor.org editorial staff