<s>[INST] why does my heart beat fast at times but it feels like it is barely beating? and sometimes when i walk like at a regular pace it will start to pulse and i can feel it all through my finger tips....? it is almost like a shallow beat...? o yea i have had a ringing in my ears now for about half a year now and it hasnt seemed to have go away....Help!...please. i also have an arachnoid cyst in my head could this be causing any of these abnormalities? [/INST] Hello There After going through your medical query I understand your concern and I would like to tell you that heart beat is ever-changing phenomenon depending upon your activity level, stress and physiological changes. Most likely you are facing anxiety which is why rhinitis (ringing in ears) is also there.It's recommended for you to take some anxiolytic for few days to relieve your symptomsHopefully this information will answer your query. Kind Regards Chat Doctor.  </s>