The tongue can detect sweet, salty, sour, savory and bitter tastes. Much of what is perceived as "taste" is actually smell. People who have taste problems often have a smell disorder that can make it hard to identify a food's flavor. (Flavor is a combination of taste and smell.)

Taste problems can be caused by anything that interrupts the transfer of taste sensations to the brain. It can also be caused by conditions that affect the way the brain interprets these sensations.

Watch this video about:Tasting

The sensation of taste often decreases after age 60. Most often, salty and sweet tastes are lost first. Bitter and sour tastes last slightly longer.

Causes of impaired taste include:

• Bell palsy
• Common cold
• Flu and other viral infections
• Nasal infection, nasal polyps, sinusitis
• Pharyngitis and strep throat
• Salivary gland infections
• Head trauma

Other causes are:

• Ear surgery or injury
• Sinus or anterior skull base surgery
• Heavy smoking (especially pipe or cigar smoking)
• Injury to the mouth, nose, or head
• Mouth dryness
• Medicines, such as thyroid drugs, captopril, griseofulvin, lithium, penicillamine, procarbazine, rifampin, clarithromycin, and some drugs used to treat cancer
• Swollen or inflamed gums (gingivitis)
• Vitamin B12 or zinc deficiency

Follow your health care provider's instructions. This may include changes to your diet. For taste problems due to the common cold or flu, normal taste should return when the illness passes. If you smoke, stop smoking.

Contact your provider if your taste problems do not go away, or if abnormal tastes occur with other symptoms.

The provider will perform a physical exam and ask questions, including:

• Do all foods and drinks taste the same?
• Do you smoke?
• Does this change in taste affect the ability to eat normally?
• Have you noticed any problems with your sense of smell?
• Have you recently changed toothpaste or mouthwash?
• How long has the taste problem lasted?
• Have you been sick or injured recently?
• What medicines do you take?
• What other symptoms do you have? (For example, appetite loss or breathing problems?)
• When is the last time you went to the dentist?

If the taste problem is due to allergies or sinusitis, you may get medicine to relieve a stuffy nose. If a medicine you are taking is to blame, you may need to change your dose or switch to a different drug.

A CT scan or MRI scan may be done to look at the sinuses or the part of the brain that controls the sense of smell.

Loss of taste; Metallic taste; Dysgeusia; Hypogeusia

Alwani MM, Makki FM, Robbins KT. Physiology of the oral cavity. In: Flint PW, Francis HW, Haughey BH, et al, eds. Cummings Otolaryngology: Head and Neck Surgery. 7th ed. Philadelphia, PA: Elsevier; 2021:chap 86.

Baloh RW, Jen JC. Smell and taste. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 399.

Doty RL, Bromley SM. Disturbances of smell and taste. In: Jankovic J, Mazziotta JC, Pomeroy SL, Newman NJ, eds. Bradley and Daroff's Neurology in Clinical Practice. 8th ed. Philadelphia, PA: Elsevier; 2022: chap 19.

Updated by: Josef Shargorodsky, MD, MPH, Johns Hopkins University School of Medicine, Baltimore, MD. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.