Researchers at the University of Edinburgh said on Wednesday they have discovered differences in the DNA of people with chronic fatigue syndrome that should help dispel the notion that the debilitating condition is psychological or driven by laziness, Reuters reported.

Their study found eight areas of genetic code that are different in people with myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) than in healthy volunteers.

The finding provides “the first robust evidence that genes contribute to a person's chance of developing the disease,” the researchers said in a statement.

The key features of the condition include worsening of fatigue, pain and brain fog after even minor physical or mental activity, according to Reuters.