What causes chills and body aches?

Chills and body aches are often caused by the body's response to infections, such as the flu or a cold, where the immune system releases chemicals that lead to inflammation. Other potential causes include viral or bacterial infections, autoimmune diseases, or even stress and fatigue. Environmental factors, such as exposure to cold temperatures, can also contribute to these symptoms. If persistent or severe, it's important to consult a healthcare professional for proper diagnosis and treatment.