8 Signs Your Immune System Is Weak

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 4. You Regularly Have Cold Sores:

Girl looking at themselves in a mirror with a worried expression, showing a visible cold sore on their lip, with a small tube of ointment on the counter.

Frequent cold sores, caused by the herpes simplex virus, happen when your immune system cannot control the virus effectively. Research indicates that people with repeated outbreaks have lower virus-specific immune responses. Low activity of natural killer cells and interferon production can directly increase the frequency of outbreaks. If cold sores appear more than a few times a year, your immunity may be compromised.

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