8 Signs Your Immune System Is Weak
4. You Regularly Have Cold Sores:

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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