Everyone gets ill sometimes whether it’s a common cough or cold or the flu but some people seem to feel unwell more than others. Infectious diseases caused by bacteria and viruses and non-infectious diseases linked to lifestyle, environment and genetics lead to illnesses . A doctor based in the UK has shared five big reasons why people fall ill. GP Dr Sami is a qualified medical professional who shares educational health videos, expert advice and tips on TikTok . In a recent post on the