Sorry for the confusion. Though I can try answering like a doctor, as a language model I have no way to run checks and can't guarantee an accurate diagnosis of your health problems. It is strongly recommended to consult a real doctor instead.
The most common cause of sternum pain is a condition called costochondritis. This occurs when the cartilage that connects your ribs to your sternum becomes inflamed. But this usually causes sharp pains instead.
Sternoclavicular arthritis can cause pain at the top of the sternum, with worsening pain with activity.
A strained or pulled muscle in the chest wall can also cause chest bone pain, also with worsening pain with activity.
A heart attack can cause pain or pressure under the sternum. The symptoms might also include pain radiating to the arm or jaw, hortness of breath, nausea and sweating.
Other causes include pneumonia or bronchitis, blood clot existence in the lung, anxiety and tumors.
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