Complications of Mononucleosis
When teens and adults get mononucleosis, they can experience debilitating symptoms, such as extreme exhaustion, muscle aches, and sore throat. For most people, symptoms subside after two to four weeks, though you may feel lingering fatigue and tire more easily for up to two months after symptoms go away. (1,2) But beyond that, most of the time you won’t experience longer-term effects of the illness.
In some cases, however, having been exposed to the Epstein-Barr virus (EBV), the main virus responsible for causing mono, can lead to long-term complications and symptoms that persist and, in some cases, even become worse. (3)
EBV is a herpesvirus, and it remains in the body once you get it. Typically, it stays completely dormant, or if you do get mono, it stays dormant after causing the initial case of mono. The virus, however, can sometimes be reactivated. That can cause problems for certain individuals, such as those who have weakened immune systems, says Eric Johannsen, MD, an associate professor of infectious diseases and EBV expert at the University of Wisconsin School of Medicine and Public Health in Madison. In these people, symptoms can recur for weeks, months, or years after recovering from the initial mono illness.(4)
Here’s what you should know about the complications that can crop up.
Mono can cause a variety of complications that can sometimes turn into serious problems. Getting the rest your doctor prescribes and waiting to resume normal activity may help your immune system destroy the virus. Complications from mono include:
These complications are rarer but have also been linked to EBV:
People who have impaired immune systems, including people with serious illnesses (like HIV/AIDS) that weaken the immune system or people taking drugs that suppress immunity (like after an organ transplant), are generally at a higher risk of developing complications from mono.
Additionally, there are certain individuals who may be more likely to develop illnesses related to a mono infection. “Certain populations in Asia and Central America have an increased risk of cancers,” notes Dr. Balfour. (13,14) While doctors aren’t sure what may be behind this elevated risk for developing cancers related to mono, one theory suggests that something in the environment may be to blame, according to Balfour. (3,9,10)
There is some evidence that genetics play a role in who is most likely to develop mono (out of those infected with EBV), but whether or not there’s a genetic explanation for who experiences complications from mono is a topic that needs further research. (11,15,16,17)
Because certain types of lymphoma are caused by EBV, researchers are also currently exploring this connection to see if the link might help explain what makes certain people more likely to develop EBV complications. (3,4)
If you’ve had mono before and are experiencing similar symptoms again, see your doctor to find out what may be causing your illness. You may be experiencing a recurrence of mono, complications that are related to EBV, or another health problem that has symptoms similar to those of mono, such as toxoplasmosis, cytomegalovirus infections, strep throat, or HIV. (2,18)
If you see any of the following symptoms, seek emergency care right away. They could be a sign of a complication that needs urgent medical attention, Balfour says.
©2025 sitename.com All rights reserved