They found 56, 681 MS cases and 14, 621 cases of glandular fever, which is caused by the Epstein-Barr virus.

BBC: Virus and low sunlight 'raises multiple sclerosis risk'

Scientists believe that Mohammed's cancer is caused by the Epstein-Barr virus, which is better known for causing glandular fever.

BBC: Mohammed

However when they combined the effect of sunlight and glandular fever, 72% of the variation in MS cases could be explained.

BBC: Virus and low sunlight 'raises multiple sclerosis risk'

Certain drugs can trigger glandular breast growth in men, as can some rare genetic and hormonal diseases, as well as excessive alcohol consumption.

BBC: With gynaecomastia the breast takes on a womanly shape

Any excess fat is sucked out with liposuction, but the excess glandular tissue has to be removed through a u-shaped incision around the nipple.

BBC: With gynaecomastia the breast takes on a womanly shape

There were fears that the Briton was suffering from glandular fever, something that has hit both Roger Federer and Mario Ancic in recent years.

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The 27-year-old world number two was diagnosed with glandular fever at the start of the year and admitted he has been playing catch up ever since.

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Doctors call this "nodular" or "glandular" breast tissue.

CNN: Fibrocystic breasts

Dr. Amy Evans, a pediatrician and medical director of the Center for Breastfeeding Medicine in Fresno, California, says that as many as 5% of all women have underlying medical conditions that prevent or seriously hinder lactation: hypoplasia, thyroid problems, hormonal imbalances and insufficient glandular tissue, among others.

CNN: Is the medical community failing breast-feeding moms?