Survivors of Ebola have been dealing with severe side effects from the illness, and now a report shows people who've fought the deadly Ebola disease are now experiencing a number of additional health issues. 

Reuters reports the survivors are experiencing symptoms from the so-called "post-Ebola Syndrome" or PES. The symptoms include body aches, memory or hair loss, headaches, anxiety attacks, extreme fatigue and vision problems. In more severe cases, people have reported mental illness, and women have stopped menstruating. A report by the World Health Organization shows doctors have seen a range of symptoms in victims of PES. Fifty percent of Ebola survivors in Kenema complain of vision problems; some doctors in West Africa have treated patients becoming fully blind after recovering from Ebola.

According to the United Nations, there are between 5,000 and 10,000 survivors of the disease. Some complain of side effects months after recovery. Victims of PES find it difficult to return to their former lives especially if they work in manual labor as farmers, laborers and housewives.

Despite the prevalence of the illness, doctors and other health experts are struggling to determine the reason behind PES.

 "Eye problems might be caused by damage to the cornea, to the nerves or something else. At this point we do not have enough information to know exactly what is going on. But we need to find out urgently so we can do whatever we can to preserve the eyesight for people who have to try to pick up their lives again," Dr. Andrew Ramsay, field coordinator for WHO in Kenema, said.

So far doctors believe Ebola survivors are more prone to autoimmune disorders and therefore susceptible to PES. Autoimmune issues are a medical condition where an over stimulated immune system doesn't recognize healthy tissues and instead attacks them.

Doctors also believe the symptoms may be caused by the disease itself or from treatment.

Doctors say there is little know about the health effects of Ebola. Prior to this outbreak, the virus was rare and left few survivors. There have been reported aftereffects of Ebola from an outbreak in 1976. However, that epidemic was smaller and more deadly, making it difficult to receive any detailed research regarding PES.

Despite the victims' health issues, this outbreak provides a unique opportunity to learn more about the disease.

Ebola has killed almost 9,000 people in Sierra Leone, Guinea and Liberia. Symptoms of the illness include fever and vomiting. The disease attacks the immune system and vital organs causing internal and external bleeding.