How to Shave or Trim Your Armpits: A Complete Guide for Men

I started shaving my armpits at the end of the 1990s, and the reason was entirely practical rather than aesthetic.

I was living in Mallorca at the time. If you've spent a summer there, you understand the heat I'm talking about — not the manageable warmth of a northern European heatwave, but the sustained, dense heat of a Mediterranean island where July and August temperatures sit in the high-thirties for weeks at a time. I was developing skin irritation under my arms from sweat accumulating in the hair, friction from clothing, and the general conditions that a hot climate creates in an enclosed, warm zone. It was uncomfortable, recurring, and resistant to the usual remedies.

Shaving my armpits eliminated the problem. Not reduced it — eliminated it. The irritation stopped. The excessive sweat smell stopped. The constant awareness of that particular area of my body throughout a hot day largely stopped. I've shaved them consistently ever since, for over twenty-five years, and the idea of going back to unshaved armpits has never once been seriously tempting.

I mention all of this because armpit grooming in men carries a stigma that the practical reality doesn't support. It is, in my experience, one of the highest-return grooming decisions a man can make — particularly in warm climates, during summer, or for men who are physically active. The technique is straightforward, the maintenance is quick, and the benefits are immediate and daily.

Here is the complete guide.

Why Armpit Hair Is Worth Managing

The armpit is a textbook environment for bacterial activity: warm, enclosed, subject to friction, and — when covered in hair — resistant to the airflow and moisture evaporation that would otherwise keep it in check. Armpit odour doesn't come directly from sweat itself. It comes from bacteria metabolising sweat on the skin surface. Hair provides both a warm, moist habitat for those bacteria and a surface area that retains the byproducts of their activity.

This is why deodorant and antiperspirant work less effectively on heavily haired armpits than on shaved or trimmed ones — the product has to work through the hair to reach the skin, and the hair continues to harbour bacteria regardless. Remove the hair and you remove the bacterial habitat. Deodorant applied directly to clean, dry skin after shaving performs significantly better than the same product applied to hair.

From my time working in a pharmacy, I can confirm this is basic microbiology rather than grooming enthusiasm. Warm, occluded, hair-covered environments genuinely do support more bacterial growth than open, dry skin. The practical consequence is measurable in how you smell and feel throughout the day.

Beyond hygiene, armpit hair in summer clothing — particularly lighter fabrics and fitted shirts — shows in a way that many men find aesthetically undesirable. That's a secondary consideration for me. The hygiene and comfort case stands entirely on its own.

Trimming vs. Shaving: The Real Difference

Both approaches improve on doing nothing. The question is how much improvement you want and how much maintenance you're prepared for.

Trimming reduces the hair to a short length — a few millimetres — which meaningfully reduces the bacterial habitat and odour without the maintenance frequency of shaving. If you're new to armpit grooming and want to start somewhere low-commitment, trimming is a sensible entry point. Use a body hair trimmer with a short guard, work carefully through the armpit bowl, and the result is a cleaner, drier, better-smelling armpit with minimal effort and no technique learning curve.

Shaving removes the hair entirely, giving you smooth skin in the armpit. The hygiene benefit is maximised — no hair means no bacterial habitat beyond the skin surface itself — and deodorant effectiveness improves noticeably. The trade-off is that armpit hair regrows quickly and visibly, requiring attention every two to three days to maintain a properly shaved result. For men who don't mind that maintenance frequency, shaving delivers the better outcome by a meaningful margin.

My personal position has been full shaving since the late 1990s. For anyone who runs hot, lives in or visits warm climates, exercises regularly, or has had the kind of skin irritation I experienced in Mallorca — shaving is the right answer. It isn't more complicated than trimming once you've done it a few times, and the daily quality-of-life improvement is disproportionately large.

Preparation

The armpit is one of the more forgiving areas to shave compared to the groin or perianal zones, but preparation still matters.

Shower first in warm water. This softens the hair shaft and opens the pores, which reduces resistance and produces a cleaner cut with less irritation afterwards. The armpit hair tends to be coarser than body hair elsewhere — warm water makes a genuine difference to how cleanly a razor moves through it.

If you're shaving from a longer baseline — first time, or returning after a period of not grooming — trim first. A razor against long, dense armpit hair drags, clogs, and dulls quickly. Trim to a few millimetres with a body trimmer first, then follow with the razor. For regular maintenance, where the hair is already short from the previous shave, you can go straight to the razor.

Apply a shaving gel or cream to the armpit before the razor. This is more important here than on some other areas because the skin in the armpit bowl has folds and the hair grows in multiple directions — gel or cream provides the slip that allows the razor to navigate without catching. A small amount rubbed into the area until lathered is sufficient.

Technique: How to Shave Your Armpits

The armpit bowl has a particular challenge that flat areas of the body don't: the skin is loose and creased, and the hair grows in multiple directions rather than a consistent grain. Both of these require a slightly more attentive approach than shaving the chest or stomach.

Raise your arm fully and rest your hand on top of your head or behind your neck — whichever gives you better access and a more relaxed armpit. Full extension pulls the skin taut naturally, which is exactly what you want. The more stretched and flat the skin, the cleaner and safer the razor's path.

Work in sections rather than trying to cover the whole armpit in one or two long strokes. Short strokes of two to three centimetres, rinsing the blade after every two or three passes. The hair grows in different directions across the armpit bowl — downward near the top, upward near the bottom, and in varying diagonal directions across the middle. This means no single stroke direction covers everything cleanly.

Start with downward strokes to catch the hair growing in that direction, then make a second pass with upward strokes, then across in both directions to catch what remains. This multi-directional approach takes a few extra passes but produces a genuinely smooth result rather than leaving patches of hair that ran against your initial stroke direction.

No downward pressure on the razor at any point. The blade does the work under its own weight. Pressing harder increases irritation without improving the result.

Rinse thoroughly with cool water when done. Cool water helps calm the skin and close the pores after shaving — the armpit skin can be reactive immediately after, and cool rinsing reduces the redness and sensitivity that hot water leaves behind.

Aftercare: The Step That Prevents Irritation

Armpit skin is sensitive to products applied immediately after shaving in a way that it isn't once the skin has settled. The twenty to thirty minutes immediately after shaving are when irritation is most likely to develop — and the choices you make in that window determine how your skin responds.

Pat dry gently with a clean towel. Never rub freshly shaved armpit skin — rubbing aggravates the area and significantly increases the likelihood of a rash.

Wait at least fifteen to twenty minutes before applying deodorant or antiperspirant. This is the most commonly skipped step and the one most responsible for post-shave armpit irritation. Applying deodorant to freshly shaved skin — particularly anything containing alcohol or strong fragrance — introduces chemicals to a surface where the skin barrier has just been worked. The result is often a burning, stinging irritation that men attribute to shaving sensitivity when it's actually a product timing issue. Wait. The skin settles quickly and the deodorant performs better on settled skin anyway.

When you do apply deodorant, use a fragrance-free or sensitive-formula version for the first day or two after shaving if your skin tends to react. Once the skin is established — a day or so after shaving — your regular deodorant can be applied normally.

Moisturising the armpit after shaving is less critical than in the groin zone, but a light fragrance-free balm applied after the skin has settled reduces the occasional dryness and tightness that some men experience between shaves. It takes ten seconds and makes the skin more comfortable during the regrowth phase.

How Often

Armpit hair grows back faster than most body hair zones — visibly stubbled within two to three days in most men, noticeably long again within a week. For men who prefer the completely smooth result, shaving every two to three days is the maintenance rhythm that keeps things consistent.

This sounds like a lot until you've done it a few times and realised that armpit shaving takes approximately ninety seconds once the technique is established. It becomes part of the shower routine without meaningful time investment — raise the arm, three minutes of attention across both sides, done.

The first few sessions take longer while you're learning the grain directions and finding the stroke angles that work best for your particular armpit shape. By the fifth or sixth session it's automatic.

A Note for Men Who've Had Armpit Irritation

If you've experienced persistent skin irritation under your arms — redness, heat rash, folliculitis, or the general discomfort of sweat accumulating in hair in warm conditions — shaving is worth trying before anything else. It was the solution for me in Mallorca and it has been for many men I've spoken to since.

The combination of shaved skin, proper aftercare timing, and a sensitive deodorant applied to settled rather than freshly shaved skin eliminates the majority of armpit irritation problems that men experience. The irritation is usually not a skin condition — it's an environment condition. Remove the environment that causes it and the irritation stops.

Twenty-five years without recurring armpit skin problems is my evidence. It's not a controlled trial, but it's a consistent personal result that I'll stand behind. Great technique only takes you so far — the trimmer matters too. See our full roundup of the best body groomers for men.

Jerome