What anatomical structures on the left side of the body could be responsible for causing pain?

Your left side is filled with many important structures that work together. Nerves, which carry messages from your body to your brain, can send pain signals if they become damaged or irritated. Muscles, tendons, and joints also play a big part in how we feel. For example, tendinitis—a swelling or irritation of a tendon—can cause pain similar to what people with fibromyalgia experience. Furthermore, bones and the spine on the left side can be sources of pain when they are injured or affected by conditions like arthritis. Sometimes, pain might even start in the brain. For example, if there is a stroke in the part of the brain that controls sensation on the left side, you might feel pain and other unusual symptoms there. All of these structures together help explain why pain might occur on one side of your body. If you experience ongoing or worsening pain, you can start by using our free AI symptom checker to better understand your symptoms, and then talk to a healthcare provider so they can properly evaluate your condition.