Do I really need to wear sunscreen every day?

Sunscreen is often seen as something you only need on holiday or on particularly sunny days. But in clinic, I regularly see skin damage that could have been reduced, or even avoided, with more consistent use.

So it’s understandable to wonder whether daily sunscreen really makes a difference, or if it’s just another step in your routine.

In practice, it plays a much bigger role in long-term skin health than most people expect.

Why is sunscreen so important?

There are two main reasons why sunscreen matters, regardless of your skin type.

The first is skin cancer risk. Ultraviolet (UV) radiation contributes to the majority of melanoma cases, one of the most serious forms of skin cancer. While fairer skin types are at higher risk, people with darker skin are not immune.

The second is skin ageing. Up to 90% of visible skin ageing, including pigmentation, fine lines, and loss of elasticity, is linked to UV exposure.

In other words, sunscreen is not just about preventing sunburn. It is one of the most effective ways to protect both the health and appearance of your skin over time.

Do I need to wear sunscreen every day?

In most cases, yes.

If you are spending more than a short amount of time outdoors, sunscreen should be part of your daily routine. Even on cloudy days, up to 80% of UV rays can still reach your skin.

What often catches people out is how cumulative sun exposure is. It is the day-to-day exposure, rather than occasional intense sun, that gradually leads to both skin damage and visible ageing.

What kind of sunscreen should I use?

Not all sunscreens are the same, but the most important thing is choosing one that provides the right type of protection and that you will actually use.

Look for a sunscreen that is:

• broad spectrum, meaning it protects against both UVA and UVB rays
• at least SPF 30 if you burn easily, or SPF 15 or above for general daily use
• suitable for your skin type, so it feels comfortable to wear regularly

There are two main types.

Chemical sunscreens absorb UV radiation and convert it into heat. They tend to feel lighter on the skin but need to be applied slightly in advance to be fully effective.

Physical (mineral) sunscreens contain ingredients such as zinc oxide or titanium dioxide, which sit on the skin and reflect UV radiation. These are often better tolerated by sensitive skin, although they can feel heavier or leave a slight residue.

How much sunscreen should I apply?

This is one of the areas where people most often fall short.

As a rough guide:

• a shot glass amount is needed to cover the whole body
• for the face and neck, roughly a quarter of a teaspoon is recommended

Using less than this means you are not getting the level of protection stated on the label, even if the SPF sounds high.

When and how often should I apply it?

Sunscreen should be applied before going outdoors and reapplied regularly throughout the day.

To maintain protection:

• apply before sun exposure
• reapply every two hours
• reapply after swimming or sweating

Even with good initial application, protection gradually wears off, which is why reapplication matters.

Are more expensive sunscreens better?

Not necessarily.

There is no consistent link between price and effectiveness. Some more affordable sunscreens perform extremely well, and some expensive ones offer no additional benefit.

The most important thing is choosing a product that provides reliable protection and that fits easily into your routine.

Are there any areas people often forget?

Yes, and these are often the areas where I see early signs of sun damage.

Commonly missed areas include:

• the lips
• around the eyes
• the ears
• the neck

Using an SPF lip balm and wearing good quality sunglasses can help protect more delicate areas.

Sunscreen is not just for hot or sunny days. It is a simple habit that, over time, makes a meaningful difference to your skin.

For most people, consistency matters far more than finding the “perfect” product.

About the author

Dr Anjali Mahto is a London-based Consultant Dermatologist and cosmetic skin expert, specialising in acne, rosacea, and advanced non-surgical treatments. She is the bestselling author of The Skincare Bible and is known for combining evidence-based dermatology with a holistic, patient-focused approach to skin health.