The libraryDefense

Stop Getting Sick All the Time

Always getting sick

Also called Frequent colds and infections, Weak immune system, Keep getting sick, Low immunity

3 min plan68 min with every studyUpdated Sep 27, 2026

Who it's forA man who catches every cold going, or whose colds and flu drag on for weeks.

When to see a doctor
  • Sudden chest pain, severe difficulty breathing, or coughing up blood: emergency care now.
  • Feeling short of breath, or chest pain, with a cold or flu.
  • A high temperature for more than 3 days, or a very high one with shivering.
  • Cold symptoms that get worse, or are not better after 10 days.
  • A cough for more than 3 weeks.
  • Flu symptoms that do not improve after 7 days, or flu with a long-term condition or a weakened immune system.
  • Sinusitis no better after 3 weeks of treating it yourself, sinusitis that keeps coming back, or symptoms on one side of the face only.
  • A shingles rash on or near the eye or nose, or changes to your vision: urgent. Any shingles rash: a pharmacist or doctor within 3 days.

I am not a doctor. This is not medical advice. This is self-education. Every dose on this page is the one a trial or a label used, quoted from it. It is not a prescription. Talk to a physician who has your history before anything in the With a doctor group.