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Sepsis and thyroid can cause lower body temps. 98.8 is considered the average-not everybody falls into the average. Too, I've read that temperature fluctuates.
There are many problems which will cause chronic low body temperature, from post traumatic stress syndrome to warts, from Candida Albecans to Hashimoto's Thyroiditis. What will help you, depends upon the cause and the state of your body.