10 Warning Signs That Your Immune System Is Malfunctioning

4. Abnormal Sensitivity to Cold (Raynaud’s Phenomenon)
Do your fingers and toes turn white or blue in the slightest cold or stress? This phenomenon, known as Raynaud’s, indicates an overreaction of the immune system that causes blood vessels to spasm. Furthermore, constantly cold hands and feet can stem from an underactive thyroid (hypothyroidism), which is often rooted in the immune system attacking the thyroid gland (Hashimoto's). This temperature imbalance shows that the immune system is disrupting the body's circulation and hormonal settings.