why do glands enlarge ?? – Ytterbium Zone

Question: why do glands enlarge ??
- Keywords:
  body,
  disease,
  gland,
  human
Asked by jess bridge :) to Iain, Hayley on 16 Jun 2015.
- anon answered on 16 Jun 2015:
  
  Glands are part of the immune system and help fight infections, bacteria and viruses. When they enlarge or swell it is a sign of them being active in fighting an infection.

Question: why do glands enlarge ??