Phlegm
Free Symptom Checker
with Physician-supervised AI

Reviewed By:

Phillip Aguila, MD, MBA

Phillip Aguila, MD, MBA (Respiratory medicine, Critical Care)

Dr. Aguila graduated from West Virginia University School of Medicine. He has trained in Pulmonary and Critical Care Medicine at The University of North Carolina in Chapel Hill and Internal Medicine at Medical College of Pennsylvania/Hahnemann University at Allegheny General Hospital in Pittsburgh Pennsylvania. He has served as Assistant Professor since 2010.

Eisaku Kamakura, MD

Eisaku Kamakura, MD (Respiratory medicine)

Dr. Kamakura graduated from the Tokyo Medical and Dental University, School of Dentistry, and the Niigata University School of Medicine. He trained at Yokosuka Kyosai Hospital and held positions in the Respiratory Medicine departments at Yokosuka Kyosai Hospital, Tokyo Medical and Dental University, Ome City General Hospital, and Musashino Red Cross Hospital. In 2021, he became the specially appointed assistant professor at the Department of General Medicine, Niigata University School of Medicine.

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  • Coughing up phlegm stained with blood

  • Coughing up phlegm

  • Blood stained phlegm

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Content updated on Jan 4, 2023

About the symptom

Phlegm is a form of mucus produced in the lungs. You usually don't produce noticeable amounts of phlegm unless you have a cold or another underlying medical condition. Sputum is the term for phlegm that is coughed up.

When to see a doctor

Seek professional care if you experience any of the following symptoms

  • Repeated fever above 38 ℃

  • Peripheral cyanosis

  • Difficulty breathing / breathlessness

  • Respiratory wheeze

  • Fever

Possible causes

  • Gastro Esophageal Reflux Disease (GERD)

    A condition where stomach acid flows back up the esophagus (food pipe). It can be caused or worsened by obesity, alcohol, and caffeine. Eating habits also play a role - eating large meals quickly or lying down after meals are known triggers.

  • Cough variant asthma

    A kind of asthma with the main symptom being a constant dry cough. This occurs because the airways are very sensitive and overreact to foreign substances. The root cause is unclear but involves genetics. Many triggers for asthma flare-ups exist, including smoke, pollen, dust mite droppings, cold weather, exercise, and viral infections.

  • Common cold (upper respiratory tract infection)

    Viral infection of the nose and throat. Symptoms include coughing, runny nose, and throat pain. Most colds are caused by viruses; a few are caused by bacteria.

  • Acute / chronic tracheitis / bronchitis
  • Sinusitis

Related serious diseases

Questions your doctor may ask about this symptom

Your doctor may ask these questions to check for this symptom

  • Do you have phlegm?

  • Do you have blood in your phlegm?

  • Do you have a cough?

  • Do you have a fever?

  • Do you have a sore throat?

Other Related Symptoms

Similar symptoms or complaints

  • Cough

Symptoms treated by the same specialty

Reviewed By:

Phillip Aguila, MD, MBA

Phillip Aguila, MD, MBA (Respiratory medicine, Critical Care)

Dr. Aguila graduated from West Virginia University School of Medicine. He has trained in Pulmonary and Critical Care Medicine at The University of North Carolina in Chapel Hill and Internal Medicine at Medical College of Pennsylvania/Hahnemann University at Allegheny General Hospital in Pittsburgh Pennsylvania. He has served as Assistant Professor since 2010.

Eisaku Kamakura, MD

Eisaku Kamakura, MD (Respiratory medicine)

Dr. Kamakura graduated from the Tokyo Medical and Dental University, School of Dentistry, and the Niigata University School of Medicine. He trained at Yokosuka Kyosai Hospital and held positions in the Respiratory Medicine departments at Yokosuka Kyosai Hospital, Tokyo Medical and Dental University, Ome City General Hospital, and Musashino Red Cross Hospital. In 2021, he became the specially appointed assistant professor at the Department of General Medicine, Niigata University School of Medicine.

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