Brown saliva.. Also.. Concerned with acid reflux.. Consult a gastroenterologist if you have the same scenario for many days.. Mite be GERD ... Can be treated.. And secondly.. Mite just be for a day.. Due to previous days type of food... Thirdly.. U mite just had issue with gums..

Acid reflux, in which digestive juices from the stomach regurgitate into the esophagus

You may be having bleeding from your gums or elsewhere. Pls consult a dentist and if no dental problem then consult a physician. Do you have any illness ?

Your symptoms are suggestive of hyperacidity causing GERD which has led to the brown sputum most likely. You may require antacids to control your situation. The following steps may help: - Don't skip meals, you may not feel like eating but in such conditions you should have the reduced amount in frequent intervals(i.e. 3 square meals broken down to 5 or 6 as you can tolerate) and slowly increase as you get better. - Reduce/ Avoid spicy,fried, fatty, junk and oily food - Avoid/ Limit drinking coffee, tea and carbonated drinks to once a day - Exercise regularly (30-45mins of cardio exercises) - Increase daily intake of water to 3 liters - Reduce stress through methods such as yoga/meditation. - Avoid painkillers as it will increase your gastric problems at this moment. If the problem persists or worsens visit the ER at the earliest.