It’s completely understandable to feel concerned about persistent pain. Several factors could contribute to discomfort on the left side, including muscle strain, digestive issues, or sometimes even referred pain from other areas. While your ultrasound didn’t reveal anything significant, it’s crucial to continue monitoring your symptoms. I recommend keeping a daily log of any additional signs you experience. It might be beneficial to consult a surgeon for further evaluation, especially if the pain persists or worsens.