What could cause drastic change of taste and smell?

Hello,

Welcome to icliniq.com.

I can understand your concern.

I understand this sudden change in your taste and smell has been distressing. Let us go step-by-step:

The probable causes:

• Post-viral effects – Even mild or unnoticed respiratory infections (including COVID-19) can cause prolonged changes.

• Nasal or sinus issues – Chronic sinusitis, allergies, nasal polyps.

• Neurological causes – Issues involving the olfactory nerve or brain pathways.

• Nutritional deficiencies – Especially zinc, vitamin B12, and iron.

• Hormonal changes – Although your IUD (intra-uterine device) is not usually a common cause, hormonal fluctuations can affect taste and smell.

• Dental or oral health problems – Gum disease, infections.

Investigations to be done:

• Physical exam – ENT (ear-nose-throat) examination to assess the nasopharynx, sinuses, and oral health.

• Laboratory work – CBC (complete blood count), fasting blood sugar, thyroid profile, vitamin B12, zinc levels.

• COVID-19 antibody or PCR (if not previously checked), as some cases present only with smell or taste changes.

• Smell and taste testing – A Simple clinical olfactory test.

Regarding follow-up:

Please follow up soon.

Preventive measures:

• Maintain good nasal hygiene with saline rinses.

• Ensure a balanced diet with adequate zinc (nuts, seeds, seafood) and B12.

• Avoid smoking, excessive alcohol, or strong irritants.

• Keep a diary of foods that trigger bad taste or smell for pattern tracking.

• If symptoms worsen or are accompanied by headaches, vision changes, or neurological deficits, seek urgent care.

I hope this helps.

Kindly follow up if you have more concerns.

Thank you.