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Qat (Khat) Chewing–Related Oral Lesions

Overview

Qat (also spelled “khat,” scientific name Catha edulis) is a leafy plant native to the Horn of Africa and the Arabian Peninsula. The fresh leaves are chewed for their stimulant effect, which is caused primarily by the alkaloids cathinone and cathine. While many people use qat socially and culturally, chronic chewing is associated with a distinctive set of oral health problems called qat‑related oral lesions (QROL). These lesions range from mild mucosal irritation to potentially malignant changes.

Who is affected? Qat chewing is most common among:

• Men aged 15–45 in Yemen, Somalia, Ethiopia, Djibouti, Kenya, and parts of Saudi Arabia.
• Female chewers in urban settings where the practice has spread (e.g., diaspora communities in the UK, USA, and Canada).
• Individuals of lower socioeconomic status who use qat daily for its appetite‑suppressing and mood‑enhancing properties.

According to the World Health Organization, up to 20 % of adults in Yemen and 10 % in Ethiopia use qat regularly, translating to millions of potential users worldwide (WHO, 2022). The prevalence of QROL among regular chewers varies between studies but is estimated at **30–55 %**, with higher rates in those who chew for >4 hours per day (Al‑Mekhlafi et al., *J Oral Pathol Med*, 2021).

Symptoms

Qat‑related oral lesions may be asymptomatic early on, but most patients notice one or more of the following:

• White or greyish patches (leukoplakia) – often focal, located on the buccal mucosa where the qat bolus rests.
• Red, velvety areas (erythroplakia) – may bleed easily and are considered higher‑risk for malignant transformation.
• Ulcerations – shallow or deep sores that can be painful, especially when chewing or eating.
• Fibrous bands or “chewer’s line” – a linear, firm band of tissue at the site of repetitive pressure.
• Horizontal or vertical “chew lines” – parallel grooves caused by the edge of the quid.
• Hyperkeratotic plaques – thickened, roughened mucosa that may feel “leathery.”
• Gingival recession & periodontitis – due to poor oral hygiene and mechanical trauma.
• Burning sensation or dysesthesia – especially after chewing a fresh qat bolus.
• Halitosis (bad breath) – resulting from bacterial overgrowth and retained plant material.
• Difficulty opening the mouth (trismus) – from chronic inflammation of the muscles of mastication.

Lesions are usually bilateral and symmetric, reflecting the habitual placement of the qat quid on both cheeks.

Causes and Risk Factors

Primary cause

The mechanical and chemical actions of qat chewing create a unique environment that predisposes oral tissues to damage:

• Mechanical irritation: prolonged pressure from the bolus and the repetitive motion of chewing cause micro‑trauma.
• Chemical irritation: cathinone, tannins, and other plant metabolites are mildly acidic and can disrupt the epithelial barrier.
• Salivary changes: qat reduces salivary flow (xerostomia) and alters pH, favoring bacterial colonisation.

Risk factors

Factor	Why it matters
Daily chewing >4 hours	Longer exposure → higher cumulative trauma.
Age < 35 years	Younger mucosa is more pliable and more likely to develop adaptive changes.
Co‑existing tobacco or alcohol use	Synergistic effect on mucosal dysplasia.
Poor oral hygiene	Increases bacterial load and slows healing.
Nutrition deficiency (esp. Vitamin C, B‑complex)	Impaired collagen synthesis and epithelial turnover.

Diagnosis

Diagnosing QROL involves a combination of patient history, visual examination, and, when indicated, laboratory investigations.

Clinical assessment

1. History taking: duration, frequency, and amount of qat chewed; concurrent tobacco/alcohol use; oral hygiene practices.
2. Inspection: use of a mouth mirror and adequate lighting to identify whitish patches, erythema, ulceration, or fibrous bands.
3. Palpation: assess lesion firmness, induration, and fixation to underlying tissues.

Adjunctive tests

• Toluidine blue staining – highlights areas of dysplasia; positive staining warrants biopsy.
• Brush biopsy (cytology) – minimally invasive cell sampling for atypia.
• Incisional or excisional biopsy – gold standard for histopathologic diagnosis; assesses for hyperkeratosis, dysplasia, or carcinoma in situ.
• Imaging – panoramic radiograph or cone‑beam CT if bone involvement is suspected.

Clinical guidelines from the American Academy of Oral & Maxillofacial Pathology recommend biopsy for any lesion persisting >3 weeks, >1 cm in size, or exhibiting erythematous borders (AAOMP, 2023).

Treatment Options

Treatment is multidisciplinary, targeting the lesion itself, the underlying habit, and any co‑morbid oral disease.

Behavioral & lifestyle interventions

• Ceasing qat chewing – the most critical step; counseling and support groups improve success rates.
• Smoking cessation – nicotine replacement therapy or varenicline can be used concurrently.
• Improved oral hygiene – twice‑daily brushing with fluoride toothpaste, flossing, and antimicrobial mouth rinses (e.g., chlorhexidine 0.12%).
• Nutritional support – Vitamin C (500 mg daily) and B‑complex supplementation may aid mucosal healing.

Pharmacologic therapies

Medication	Indication	Typical dose
Topical corticosteroids (e.g., clobetasol propionate 0.05% gel)	Inflammatory lesions, ulcerations	Apply 2‑3 times/day for up to 2 weeks
Topical antifungals (e.g., nystatin suspension)	Secondary Candida infection	Swish & spit 4‑5 ml q.i.d.
Systemic retinoids (e.g., acitretin)	Severe leukoplakia with dysplasia	25 mg daily, monitored for liver function
Analgesics (acetaminophen, ibuprofen)	Pain control	According to label

Surgical & procedural options

• Excisional biopsy – removal of small, suspicious lesions with clear margins.
• Laser ablation (CO₂ or diode laser) – effective for superficial leukoplakia; reduces bleeding.
• Electrocautery – alternative for ulcerated areas.
• Reconstructive surgery – indicated for large fibrous bands causing trismus.

Follow‑up care

Patients with dysplastic lesions should be reviewed every 3–6 months for at least 5 years, as the risk of malignant transformation can persist (Mayo Clinic, 2022).

Living with Qat (Khat) Chewing–Related Oral Lesions

Daily oral‑care routine

1. Brush gently with a soft‑bristle toothbrush after each meal.
2. Floss or use interdental brushes daily to disrupt plaque.
3. Rinse with alcohol‑free antimicrobial mouthwash (0.12 % chlorhexidine) twice a day for 30 seconds.
4. Inspect your mouth in a mirror each evening; photograph any new or changing lesions.
5. Stay hydrated – sip water frequently to counteract xerostomia.

Managing discomfort

• Apply a cold compress to painful areas for 10 minutes.
• Use over‑the‑counter topical anesthetics (e.g., benzocaine gel) sparingly.
• Avoid spicy, acidic, or very hot foods that can aggravate ulcerations.

Psychosocial support

Because qat chewing often has cultural and social dimensions, consider:

• Joining community cessation programs.
• Speaking with a mental‑health professional if chewing was used to self‑medicate anxiety or depression.
• Engaging family members in the quitting process to reduce peer pressure.

Prevention

Preventing QROL essentially means preventing chronic qat exposure, coupled with good oral health habits.

• Limit or avoid qat use – even occasional chewing can initiate mucosal changes.
• Regular dental check‑ups – at least once every six months; your dentist can spot early lesions.
• Vaccination against HPV – reduces overall risk of oral cancer, which can coexist with QROL.
• Maintain a balanced diet – foods rich in antioxidants (berries, leafy greens) support mucosal repair.
• Use protective chewing devices – research is ongoing, but some clinicians recommend a silicone guard to distribute pressure, though quitting remains the most effective.

Complications

If left untreated, QROL can progress to serious conditions:

• Oral squamous cell carcinoma (OSCC) – the malignant transformation rate of QROL with dysplasia is estimated at 5–12 % over 10 years (Cleveland Clinic, 2023).
• Severe periodontal disease – bone loss leading to tooth mobility or loss.
• Chronic pain and nutrition impairment – ulcerations may cause difficulty eating, leading to weight loss.
• Secondary infections – bacterial or fungal overgrowth in ulcerated tissue.
• Functional limitation – fibrous bands can restrict mouth opening, affecting speech and oral hygiene.

When to Seek Emergency Care

References

1. World Health Organization. Khat (Catha edulis) – health and social implications. WHO Bulletin. 2022.
2. Al‑Mekhlafi, A. et al. “Prevalence of Oral Lesions among Chronic Qat Chewers in Yemen.” Journal of Oral Pathology & Medicine. 2021;50(3):215‑223.
3. Mayo Clinic. “Leukoplakia and Oral Cancer.” Updated 2022.
4. American Academy of Oral & Maxillofacial Pathology. “Guidelines for Biopsy of Oral Lesions.” 2023.
5. Cleveland Clinic. “Oral Cancer Risk Factors and Prevention.” 2023.
6. CDC. “Human Papillomavirus (HPV) and Cancer.” 2024.
7. National Institutes of Health. “Retinoids in Management of Oral Dysplasia.” 2021.

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