Kindly refer to the following link(s):
What are the 7 things that breaks the fast?
Verbally abusing people or fighting, reduces reward of fasting
Wet dream / Masturbation during Fasting
What to do if I am fasting & wake up with dry traces of gum bleed in my mouth?
Does swallowing saliva, mucus, traces of blood break your fast?
Does donating blood break your fast?
Taking blood samples for Blood tests does not nullify your fast
IV (Intravenous Fluids) invalidate your fast?
Do IV or Injections break your fast?