She Could Not Eat, and the Problem Was Her Mouth, Not the Nausea

Quick answer: Oral mucositis during chemotherapy is common, painful and often undertreated. It is not an infection in itself, and it can become one. Good mouth care during treatment reduces its severity measurably — and a mouth problem in a neutropenic patient is a medical emergency, not a dental inconvenience.

The call

Her oncology nurse phoned, which is not the usual route and was the right one.

Devora, 54, from RBS Bet, was ten days into her second cycle of chemotherapy for breast cancer. She had stopped eating solid food, had lost weight, and had told the team the nausea was the problem. The nurse had looked in her mouth and thought otherwise.

What we found

Extensive mucositis. The lining of both cheeks, the sides and underside of her tongue and the soft palate were red, raw and ulcerated, with white-yellow patches where the surface had sloughed. The gum margins were inflamed.

She could not tolerate her toothbrush and had stopped using it a week earlier. She was rinsing with a commercial mouthwash containing alcohol, which she had assumed would help and which had been making it considerably worse.

We also found candida — a superimposed fungal infection, common in this setting and easy to miss against the background inflammation.

What mucositis is. Chemotherapy targets rapidly dividing cells. The lining of the mouth turns over every few days, which makes it one of the most vulnerable tissues in the body. The result is breakdown of the mucosal barrier, typically appearing five to ten days after a cycle and resolving as counts recover.

It matters for three reasons beyond the pain:

• Nutrition. Patients stop eating, lose weight, and become less able to tolerate treatment.
• Infection. The mucosal barrier is the body's defence. With it broken and the white cell count low, oral bacteria and fungi enter the bloodstream. This is a recognised route to systemic infection in neutropenic patients.
• Treatment interruption. Severe mucositis can force dose reduction or delay, which is the outcome everyone is trying to avoid.

The critical safety point: in a patient with a low neutrophil count, a mouth infection is a medical emergency. Fever with a sore mouth during chemotherapy means immediate contact with the oncology team, not a dental appointment.

What we did

Contacted her oncology team before anything else, to confirm her blood counts and platelet level. That determines what is safe. Her platelets were adequate; her neutrophils were low but recovering.

Stopped the alcohol mouthwash immediately. It is drying, it stings intensely, and it damages already-compromised tissue.

Replaced it with what actually helps:

• A bland saline or sodium bicarbonate rinse, made at home, used frequently — every two hours while awake. Unglamorous, well tolerated, and the mainstay.
• A coating agent to give physical protection before meals.
• Topical anaesthetic rinse before eating, prescribed and used with care, since numbing the mouth affects swallowing safety.
• Systemic pain relief, coordinated with her oncology team, who escalated it appropriately. Mucositis pain is frequently undertreated.

Antifungal treatment for the candida, prescribed in liaison with her team because of interactions with several oncology drugs.

Restarted brushing, which she had stopped and which was the most important reversal. An extra-soft brush, gently, twice daily. Stopping brushing raises the bacterial load precisely when the barrier is broken.

Dietary adjustment: soft, bland, cool foods. No acidic, spicy, salty, crunchy or very hot items. Nutritional supplement drinks, arranged through her team's dietitian.

Written red flags for her and her family: fever, spreading swelling, difficulty swallowing or breathing, or inability to drink — all meaning contact the oncology team immediately, at any hour.

The outcome

Substantially better within about six days, which is the usual course once the cycle passes and the mouth is properly managed.

For subsequent cycles we put a protocol in place before each one rather than reacting: bicarbonate rinses started on day one, brushing maintained throughout, and a review scheduled at day seven.

Her later cycles produced milder mucositis. She completed treatment without dose delay.

What to do if this happens to you

1. Keep brushing, with an extra-soft brush, however sore. Stopping makes it worse.
2. Use bland saline or bicarbonate rinses frequently. Avoid anything containing alcohol.
3. Ask for adequate pain relief. Mucositis pain is routinely underestimated.
4. Contact your oncology team immediately for fever, difficulty swallowing or breathing, or inability to drink.
5. Tell your dentist before treatment starts, not during, so clearance and a plan are in place.
6. Ask for the mouth to be checked at each cycle, rather than only when it becomes unbearable.

Starting or undergoing cancer treatment? Ramat Beit Shemesh Urgent Dental Care works with your oncology team. 055-985-8845 · WhatsApp https://wa.me/972559858845 · Harav Kook 28/1, Beit Shemesh

This is a composite clinical story. It reflects a presentation we see regularly in Beit Shemesh and Ramat Beit Shemesh; the name and details are illustrative and are not those of a real patient.