HGV Driver Health Requirements: What Medical Conditions Affect Your Licence?
One of the most common concerns among people considering an HGV driving career is whether their health will prevent them from qualifying. The DVLA applies stricter medical standards to HGV and bus drivers (known as "Group 2" licence holders) than to ordinary car drivers, because the consequences of a medical episode at the wheel of a large vehicle are far more serious.
This guide explains the Group 2 medical standards, which conditions are likely to affect your licence, which are manageable with the right documentation, and what the D4 medical examination involves. For a full guide to the D4 form itself, see our HGV medical D4 form guide.
What Are Group 2 Medical Standards?
The DVLA divides driving licence holders into two groups:
| Group | Licence Categories | Medical Standard |
|---|---|---|
| Group 1 | Category B (car), A (motorcycle), BE | Standard — self-declaration for most conditions |
| Group 2 | Category C, C1, C+E, D, D1 (HGV and bus) | Stricter — medical examination required; lower thresholds for many conditions |
Group 2 standards are set out in the DVLA's "Assessing Fitness to Drive" guidance, which is updated regularly. The key principle is that conditions which might cause a sudden incapacity at the wheel — such as epilepsy, severe heart disease, or uncontrolled diabetes — are treated much more cautiously for HGV drivers than for car drivers.
When Is a Medical Required?
| Situation | Medical Required? |
|---|---|
| First application for an HGV licence (any age) | Yes — D4 form required |
| Renewing an HGV licence under age 45 | No — unless you have a notifiable condition |
| Renewing an HGV licence aged 45–65 | Yes — every five years |
| Renewing an HGV licence over 65 | Yes — annually |
| Developing a notifiable medical condition | Yes — must inform DVLA regardless of renewal date |
Common Conditions and Their Impact on HGV Licences
Diabetes
Diabetes is one of the most common conditions affecting HGV licence applications. The rules depend on how your diabetes is managed:
| Treatment | Group 2 Eligibility |
|---|---|
| Diet-controlled only | Generally eligible — no additional restrictions |
| Oral medication (e.g., metformin) | Generally eligible — annual medical review required |
| Insulin-treated | May be eligible subject to strict conditions: no severe hypoglycaemic episodes in the past 12 months; must check blood glucose before driving and every two hours; must carry fast-acting glucose; annual specialist review required |
The rules for insulin-treated diabetics were relaxed in 2011 to allow Group 2 licensing in most cases, subject to the conditions above. If you are insulin-treated and want to drive professionally, speak to your diabetes specialist about whether you meet the criteria.
Heart Conditions
Cardiovascular conditions are assessed on a case-by-case basis. Key rules include:
- Angina: Must be symptom-free and have no symptoms on moderate exertion. Annual review required.
- Heart attack (myocardial infarction): Six-week minimum off-driving period; must meet specific exercise tolerance and ejection fraction criteria before returning.
- Coronary artery bypass graft (CABG): Three-month minimum off-driving period; must meet exercise tolerance criteria.
- Atrial fibrillation: May be licensed if rate is controlled and there are no other disqualifying conditions.
- Pacemaker: Six-week minimum off-driving period after implantation; may be licensed thereafter subject to review.
Epilepsy and Seizures
Epilepsy is treated very strictly for Group 2 licences. The standard rule is:
- You must have been free from all seizures for 10 years without taking anti-epileptic medication to hold a Group 2 licence.
- A single unprovoked seizure requires a five-year seizure-free period off medication.
These rules are significantly stricter than for car drivers (one year seizure-free). If you have a history of epilepsy, you should seek specialist advice before investing in HGV training.
Vision
HGV drivers must meet specific visual acuity standards:
| Standard | Requirement |
|---|---|
| Visual acuity (with glasses/lenses if worn) | At least 6/7.5 in the better eye and at least 6/60 in the worse eye |
| Visual field | At least 160 degrees horizontal; at least 70 degrees left and right; at least 30 degrees above and below |
| Binocular vision | Required — monocular drivers (one eye) are generally not eligible for Group 2 |
| Colour vision | No specific requirement, but must be able to distinguish traffic signals |
Hearing
There is no specific hearing standard for Group 2 licences. Drivers with hearing impairments can hold HGV licences, provided they can demonstrate safe driving ability. However, if you wear hearing aids, you must wear them while driving.
Mental Health Conditions
Mental health conditions are assessed individually. The key question is whether the condition — or its treatment — could cause sudden incapacity or significantly impaired judgement while driving. Conditions that are well-controlled and stable are generally compatible with Group 2 licensing. Conditions that involve psychotic episodes, severe depression, or medication with significant sedative effects require careful assessment.
If you have a mental health condition, discuss it with your GP before applying for an HGV licence. The DVLA's guidance is clear that conditions must be declared, but declaration does not automatically mean refusal.
Sleep Apnoea
Obstructive sleep apnoea (OSA) is a significant concern for HGV drivers because it causes excessive daytime sleepiness, which is a major risk factor for road accidents. The rules are:
- Moderate to severe OSA must be declared to the DVLA.
- Drivers being treated with CPAP (continuous positive airway pressure) and who are compliant with treatment and symptom-free may be licensed.
- Untreated moderate to severe OSA is likely to result in licence refusal.
Alcohol and Drug Issues
A history of alcohol or drug dependency can affect Group 2 licensing. The DVLA typically requires a period of abstinence (usually one to three years) and medical evidence of recovery before granting or restoring a Group 2 licence.
Conditions That Do Not Affect HGV Licensing
Many common conditions have no impact on HGV licensing whatsoever:
- Well-controlled hypertension (high blood pressure)
- Asthma (unless severe and requiring frequent hospital treatment)
- Most musculoskeletal conditions (unless they significantly affect driving ability)
- Well-controlled thyroid conditions
- Most skin conditions
- Mild to moderate depression that is well-controlled
What to Do If You Have a Medical Condition
- Check the DVLA guidance: The DVLA publishes detailed guidance on specific conditions at gov.uk/guidance/assessing-fitness-to-drive. This is the authoritative source.
- Speak to your GP: Your GP can advise on whether your condition is likely to affect your licence and what documentation you will need.
- Declare honestly: Failing to declare a notifiable condition is a criminal offence and can result in prosecution, a fine, and licence revocation. The DVLA is far more likely to work with you if you are upfront.
- Seek specialist advice if needed: For complex conditions, a specialist report may be required. Your GP can refer you.
Frequently Asked Questions
Can I drive an HGV with one eye?
Generally no. Group 2 standards require binocular vision (vision in both eyes). There are very limited exceptions for drivers who lost sight in one eye before 1 January 1991 and have adapted to monocular vision, but these are assessed individually.
Do I need to declare conditions that are fully treated and causing no symptoms?
Yes, if they are on the DVLA's list of notifiable conditions. The obligation to declare applies regardless of whether the condition is currently causing symptoms. When in doubt, declare.
How often do I need a medical as an HGV driver?
Every five years between ages 45 and 65, and annually after 65. You must also inform the DVLA if you develop a notifiable condition at any point, regardless of your renewal date.
Concerned About Your Medical Eligibility?
GS Driver Training's team can advise on the medical requirements for HGV training and help you understand what documentation you will need. Contact us before booking your training if you have any concerns.
