Results show that participants with severe, untreated sleep apnea had a significant reduction in white matter fiber integrity in multiple brain areas. This brain damage was accompanied by impairments to cognition, mood and daytime alertness.
An iron deficiency can cause the nail bed to be thin and concave and have raised ridges. While most of Fox's patients don't come in to report nail problems, he routinely checks patients to make sure they have healthy fingernails. The nails offer many little clues to what's going on inside you.
1 The bluish black coloured vertical lines on your nails are warning alarms that you need to make immediate changes to your diet. 2  Deficiency of vitamin C causes reddish black spots to appear on the nail bed and also leads to hang nails.  Deficiency of vitamin A and D cause a situation called hapalonychia or soft nails.