If you’re struggling with unexplained weight gain, you may wonder: do parasites cause weight gain? While not the most common symptom, parasites can create digestive stress that leads to bloating, inflammation, and sluggish metabolism. Some infections also cause blood sugar swings and cravings that make weight harder to control. This article dives into how parasites disrupt the gut and why that imbalance may show up on the scale. Getting to the root of the issue can make healing, and weight loss—much easier.