Chills More Condition_symptoms What Does It Mean When A Person Gets Chills And Goosebumps For No Reason?

What does it mean when a person gets chills and goosebumps for no reason? - chills more condition_symptoms

Sometimes when I'm in my room (the bin is hot enough), suddenly felt a strong shudder, I'm cold, I have goose bumps and then I feel tired, my head heavy and I do not feel like myself. After a few minutes I felt normal again. The chills were so strong that it feels like my breath is exciting. Can someone tell me why this happens?