Compare · Conditions

Primary Hyperhidrosis vs Secondary Hyperhidrosis

Excessive sweating without an identified underlying disease or medicine cause. Excessive sweating caused by another condition or a medicine.

Research updated 2026-10-23
Primary HyperhidrosisAI-generated educational illustration: Visible perspiration on an adult head and torso with soaked shirt fabric, representing generalized excessive sweating.
Key differencesWhat is it?What it looks likeDiagramsWhen it startsTriggersDaily CareTreatmentOutlookComplicationsWhen to get helpQuestions

Key differences

The same eight facts on every condition comparison.

Usual age
Childhood or teens
Adults
Where
Palms, soles, armpits, face
Often whole body
Main sign
Heavy sweating, both sides
New heavy sweating
Itch or pain
Neither
Neither
Contagious
No
No
Long term
Long-term
Depends on the cause
Scars
No
No
Who gets it
About 1 in 20; runs in families
People with a medical cause or medicine

What is it?

Primary Hyperhidrosis
Secondary Hyperhidrosis
What is it?
  • What it is
    Excessive sweating without an identified underlying disease or medicine cause.
  • What it is
    Excessive sweating caused by another condition or a medicine.

What it looks like

Primary Hyperhidrosis

An open hand with beads of moisture across the palm and fingers.

Primary Hyperhidrosis The palm and fingers have a wet, shiny surface.

Secondary Hyperhidrosis

A person with wet hair and a gray shirt darkened by broad sweat patches.

Secondary Hyperhidrosis Large damp areas are visible across the shirt.

Skin tones
Primary Hyperhidrosis.
Primary Hyperhidrosis.
Primary Hyperhidrosis.
Primary Hyperhidrosis.
Secondary Hyperhidrosis.
Secondary Hyperhidrosis.
Secondary Hyperhidrosis.
Secondary Hyperhidrosis.
In the skin

Nerve signals stimulate sweat glands more strongly than cooling requires. The glands produce excess sweat even when the body does not need to lose heat.

A medicine, hormonal change or medical condition increases sweat-gland activity. The excess sweating reflects that underlying process rather than primary overactive sweat signaling alone.

When it usually starts

010203040506070+

Primary Hyperhidrosis. Usually begins in childhood or adolescence; typical primary focal sweating often stops during sleep.

Secondary Hyperhidrosis. Can begin at any age, including new adult onset.

Causes and triggers

Causes

Sweat-gland activity is over-responsive rather than simply a hygiene problem.

A medical, hormonal or medicine-related process increases sweating.

Risk factors
Family tendency
Relevant medicines, Endocrine disease, Infection
Trigger
● Primary Hyperhidrosis
● Secondary Hyperhidrosis
Heat
Can contribute
Not listed
Emotional stress
Can contribute
Not listed
Underlying illness
Not listed
Can contribute
Medicine exposure
Not listed
Can contribute

Daily Care

Primary Hyperhidrosis
Secondary Hyperhidrosis
Daily care

Habits that help

  • Choose breathable clothing and change damp garments
    Spare layers can improve comfort and reduce prolonged skin wetness.
  • Change damp socks and let shoes dry between wears
    Moisture held against the feet encourages maceration and fungal infection.
  • Keep the sleeping or working space comfortably cool
    Use lighter bedding or a fan if heat worsens symptoms.
  • Track when sweating happens and any new medicines
    A short record helps distinguish triggers from symptoms needing investigation.
  • Apply antiperspirant according to its label or your clinician’s plan
    Many stronger products work best on completely dry, unbroken skin; reduce use and seek advice if irritation occurs.

Avoid

  • Avoid: Abruptly stopping prescribed medicines
    Discuss suspected medicine-related sweating with the prescriber.
  • Avoid: Ignoring new unexplained or drenching sweats
    Sweating with fever, weight loss or other illness needs medical assessment.

Habits that help

  • Choose breathable clothing and change damp garments
    Spare layers can improve comfort and reduce prolonged skin wetness.
  • Change damp socks and let shoes dry between wears
    Moisture held against the feet encourages maceration and fungal infection.
  • Keep the sleeping or working space comfortably cool
    Use lighter bedding or a fan if heat worsens symptoms.
  • Track when sweating happens and any new medicines
    A short record helps distinguish triggers from symptoms needing investigation.
  • Discuss underlying-cause assessment
    Review medicines and associated symptoms; treatment targets the cause rather than assuming primary hyperhidrosis.

Avoid

  • Avoid: Abruptly stopping prescribed medicines
    Discuss suspected medicine-related sweating with the prescriber.
  • Avoid: Ignoring new unexplained or drenching sweats
    Sweating with fever, weight loss or other illness needs medical assessment.

Treatment differences

Evidence labels come from each condition’s own treatment list.

Treatment
● Primary Hyperhidrosis
● Secondary Hyperhidrosis
Treatment approach
—

Treatment targets the illness or medication contributing to sweating. Discuss medication changes with the prescriber rather than stopping treatment abruptly.

Over-the-counter

Aluminum antiperspirant

Listed

Often used on completely dry skin; follow the label and reduce use if irritated.

None listed

Outlook

Long term

Primary hyperhidrosis can continue for years, although it may ease with age. Treatments usually control sweating rather than permanently remove the tendency, and maintenance may be needed.

Sweating may improve when an underlying illness or medication contributor is addressed. The course depends on that cause; do not stop prescribed medication without advice.

Complications

Possible complications

Sweating can affect daily activities and increase local skin irritation.

The underlying cause determines the significance and treatment.

When to get help

When to get help

Seek assessment for a new adult onset, generalised pattern, night sweats or other symptoms.

Arrange assessment for new or unexplained sweating, particularly with fever, weight loss or palpitations.

Common questions

Primary Hyperhidrosis:What is Primary Hyperhidrosis?

Excessive sweating without an identified underlying disease or medicine cause.

Primary Hyperhidrosis:What can I do day to day?

Wear breathable clothing, change damp garments and keep a record of symptoms and medicines.

Primary Hyperhidrosis:When should I get medical advice?

Seek assessment for a new adult onset, generalised pattern, night sweats or other symptoms.

Secondary Hyperhidrosis:What is Secondary Hyperhidrosis?

Excessive sweating caused by another condition or a medicine.

Secondary Hyperhidrosis:What can I do day to day?

Wear breathable clothing, change damp garments and keep a record of symptoms and medicines.

Secondary Hyperhidrosis:When should I get medical advice?

Arrange assessment for new or unexplained sweating, particularly with fever, weight loss or palpitations.

Sources

Sources and further reading

  1. Hyperhidrosis
  2. Hyperhidrosis
Dermapedia on YouTube