Metallic taste during chemo, and what to try

Losing your sense of taste sounds trivial next to everything else treatment involves. It is not. Food is comfort, routine, family and fuel, and when it turns to metal in your mouth all four go at once.

It is also common enough to be listed as an expected effect. The National Cancer Institute names changes in taste, called dysgeusia, and changes in smell among the mouth and throat problems that cancer treatments can cause — alongside dry mouth, infections and mouth sores, oral mucositis, sensitivity to hot or cold foods, swallowing problems and tooth decay.

Elsewhere, NCI states it more broadly: changes in the sense of taste is a common side effect of both chemotherapy and head or neck radiation therapy.

This is a known effect of treatment. It is not you becoming fussy.

The suggestions on NCI's page are modest and practical. They are worth taking literally.

• If food tastes bland, marinate foods to improve their flavour, or add spices to foods.
• Try cold foods. Temperature changes how strongly flavours and smells register.
• Switch utensils if you are getting a metallic taste.

That last one is the tip people are most sceptical about and most often surprised by. Trying a plastic or wooden spoon costs nothing and takes one meal to test.

You will find long lists of taste-change hacks online, many of them confidently stated and none of them from a source like this one. Be a little careful with those, particularly anything that tells you to avoid whole food groups or to take a supplement.

What you can safely do is experiment within the directions NCI points to. Marinades and spices are a category, not a single recipe. Cold food is a category too. If something works one week and stops working the next, that is normal — taste often shifts through a cycle.

Keep a short note of what worked. When you are tired and hungry, having a list of three things you know you can currently tolerate is worth more than any amount of general advice.

Sometimes food is unappealing because the mouth itself is sore rather than because flavour has changed. NCI's guidance for that situation is different: choose foods that are soft, wet and easy to swallow, and soften dry foods with gravy, sauce or other liquids.

It also suggests asking about pain medicine, such as lozenges or sprays that numb your mouth and make eating less painful.

If your problem is pain, chase the pain. Rearranging your seasoning will not fix a sore mouth.

NCI is specific about this. Call your doctor or nurse if you have pain in your mouth, lips or throat that makes it difficult to eat, drink or sleep, or if you have a fever of 100.4 °F (38 °C) or higher.

Those are not "wait and see" symptoms. Mouth problems during treatment can escalate, and a fever during chemotherapy is always something your team wants to hear about promptly.

Two things are worth holding onto.

First, NCI's note on recovery: in most patients receiving chemotherapy, and in some patients receiving radiation therapy, taste returns to normal a few months after treatment ends.

Second, this is a reportable symptom. If you are eating badly because nothing tastes right, that is a nutrition problem as well as a comfort one, and asking whether a dietitian is available to you is a reasonable request. Nobody expects you to solve it alone at the kitchen counter.