Hello! Thank you for asking on HCM! Your symptoms don t seem to be cardiac related. I would like to know if this pain is modulated by respiratory or body movements? In such a case, the most probable cause of this symptomatology would be a musculo-skeletal pain. How old are you? Do you suffer from back pain? A thoracic nerve compression, causing irradiated radicular pain could mimic this symptomatology too. I recommend consulting with your GP for a careful physical examination, a resting ECG, a chest x ray and some blood tests (complete blood count, inflammation tests, thyroid hormone levels, blood electrolytes, fasting glucose, kidney and liver function tests, etc.) A thoracic spine x ray would be needed to rule in /out a possible vertebral column disorder, leading to radicular pain. Hope to have been helpful! Greetings! Dr. Iliri