do you notice that you get heartburn after eating certain foods or after excercise? My other half has been complaining for months with heartburn and he's just been told (apart from liver and kidney problems) he has a small hernia which is probably causing the reflux. just noticed sqad has answered but i'm going to submit this anyway even though it's only anecdotal lol
Heartburn ...See the doctor.
Also check your poo is not very dark in colour or black.
I had heart burn for 2 months , some years back and also blackish poo.
Result collapsed and spent 5 nights in hospital.
The acid reflux caused a drip bleed in my throat and slow blood lose.