Hypothermia: This is a common cause of body shivering, especially in individuals exposed to cold environments. The body's initial response to cold stress is to shiver, which helps generate heat.

Infection (e.g., pneumonia, sepsis): Infections can cause shivering due to the body's immune response, which often includes fever and chills.
Drug or alcohol withdrawal: Withdrawal from certain substances can lead to shivering among other symptoms like anxiety and tremors.
Anxiety or stress: Severe anxiety or stress can cause physical symptoms including shivering or trembling.
Hypoglycemia: Low blood sugar can cause shivering, sweating, and other symptoms as the body reacts to the lack of glucose.

Meningitis: Although less common, meningitis is a serious infection that can present with fever, chills (shivering), and severe headache. Missing this diagnosis can be fatal.
Sepsis: A severe, life-threatening response to infection, sepsis can cause shivering, fever, and other systemic symptoms. Early recognition and treatment are crucial.
Neurological disorders (e.g., multiple sclerosis, Parkinson's disease): Certain neurological conditions can cause tremors or shivering, which might be mistaken for other causes.
Thyroid disorders (e.g., hyperthyroidism): An overactive thyroid gland can cause tremors, shivering, and other metabolic symptoms.

Subarachnoid hemorrhage: A life-threatening condition involving bleeding into the space surrounding the brain, which can cause sudden, severe symptoms including shivering.
Adrenal insufficiency: A condition where the adrenal glands do not produce adequate hormones, which can lead to a variety of symptoms including shivering, especially under stress.
Certain autoimmune disorders (e.g., lupus): These can cause a wide range of symptoms including fever, chills, and shivering due to the body's immune response.
Toxins or poisoning: Exposure to certain toxins can cause shivering among other systemic symptoms.