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Doença do Homem Rígido: o que é, sintomas e tratamento em Lisboa

RIGID MEN'S DISEASE - Treatment in Lisbon

Specialised assessment and treatment for Stiff Man Syndrome in Lisbon - diagnosis, treatment and follow-up

WHAT IS RIGID MAN'S DISEASE?

Avaliação neurológica da Doença do Homem Rígido — NeuroPsyque Lisboa

A rare and often underdiagnosed autoimmune disease

Stiff Man's Disease (SPS) is a rare autoimmune neurological disease characterised by progressive muscle rigidity, painful muscle spasms and great sensitivity to stimuli such as noise or touch. In most cases, it is related to antibodies (anti-GAD65) that affect a substance in the brain responsible for “calming” nerve activity, leading to over-excitement of the nerves.

Characteristic signs and symptoms

  • Muscle stiffness in the trunk
    Strong, painful stiffness in the muscles of the back and abdomen, which can vary throughout the day and worsen with stress or stimuli such as noise or touch.
  • Sudden, painful muscle spasms
    Violent muscle contractions triggered by noise, unexpected touch, emotions or movement - with the risk of fractures and falls.
  • Hypersensitivity to external stimuli
    Exaggerated (involuntary) reactions to sound, tactile or visual stimuli that usually do not provoke a significant motor response.
  • Anxiety, phobia and psychological disorders
    Intense anxiety, fear of leaving the house and fear of falling are common. These symptoms are not just a reaction to the disease - they are also linked to changes in the functioning of the nervous system.

VARIANTS, CAUSES AND CLINICAL ASSOCIATIONS

Classic SPS - Anti-GAD65 Antibodies

The most common form. It is associated with antibodies that interfere with the part of the nervous system responsible for reducing nerve activity. This leads to progressive body rigidity, spasms and increased muscle excitability. It can also be associated with other autoimmune diseases, such as type 1 diabetes and thyroid problems.

Autoimmune

Paraneoplastic SPS - Anti-Amphiphysin and Others

It is associated with the presence of tumours, such as in the chest, lungs or thymus. The body produces antibodies that affect the nervous system. It is therefore essential to assess a possible oncological disease whenever this form is suspected.

Paraneoplastic

Stiff Limb Syndrome (SMS) - Focal Variant

This is a more localised form of the disease, in which the stiffness and spasms affect just one limb, usually one leg. It can make walking progressively more difficult and, in some cases, develop into a more generalised form.

Focal

Progressive Encephalomyelitis with Rigidity (PERM)

This is a more serious form of the disease, which affects important areas of the nervous system. It can cause involuntary movements, difficulty swallowing, changes in eye movements and problems with automatic body control (such as heartbeat or blood pressure). It is associated with certain antibodies and generally requires more intensive treatment.

Severe variant
Doença do Homem Rígido — base autoimune e sistema nervoso central

SPS is 2 to 3 times more common in women than in men, and is associated with other autoimmune diseases in more than 60% of cases - type 1 diabetes, thyroiditis, vitiligo and pernicious anaemia, among others.

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SPS: DIAGNOSIS AND RESPONSE
IMMUNOTHERAPY

A rare disease with effective treatment - early diagnosis is decisive for prognosis

7years
is the maximum diagnostic delay described in SPS - often confused with fibromyalgia, anxiety or psychiatric pathology
83%
of SPS patients respond to IGIV immunotherapy - result of meta-analysis of 12 studies and 216 patients
60-80%
of cases of classic SPS have high titres of anti-GAD65 antibodies in serum and CSF
35%
of SPS patients have associated type 1 diabetes - part of a wider spectrum of autoimmune comorbidities

* Data based on published clinical studies and case series. Individual results may vary.

Sources: clinical data, NIH/PubMed - IGIV systematic review in Stiff-Person Syndrome (12 studies, 216 patients; 83,16% symptomatic improvement); Neurology.org - IGIV in GAD+ SPS: 67% significant improvement (36 patients, 40 months follow-up); NIH/PubMed - prevalence of anti-GAD65 in classic SPS (60-80%); NIH/PubMed - autoimmune comorbidities in SPS: type 1 diabetes in 35%, autoimmune thyroiditis in 38%.

TECHNOLOGY AND THE THERAPEUTIC ENVIRONMENT

Neuroimagem
Estimulação Magnética Transcraniana
tDCS
Acupuntura
tDCS - Estimulação Eléctrica Transcraniana
qEEG
Clínica Lisboa
Ondas Cerebrais
Fisiologia
Sala Fisioterapia
Espaço Movimento e Saúde

IMPORTANCE OF SPECIALISED CONSULTATION

Stiff Man's Disease is one of the neurological diseases with the longest diagnostic delay - an average of 7 years from the first symptoms. The fluctuating stiffness (with variations over time) and painful spasms are often attributed to musculoskeletal problems, fibromyalgia or anxiety, and in some cases even to Parkinson's disease, which delays the correct diagnosis and the start of immunotherapy. This delay has direct consequences: the longer the disease goes untreated, the greater the risk of progression and serious complications such as falls, fractures and respiratory problems.

SPS is a treatable autoimmune neurological disease - diagnosis with anti-GAD65 antibody testing and early immunotherapy can radically change the prognosis.

At NeuroPsyque, the Stiff Man's Disease consultation includes a structured neurological assessment, coordination of a complete serological study (anti-GAD65, anti-amphiphysin, anti-DPPX, anti-GlyR), research into occult neoplasia when indicated, and access to non-invasive neuromodulation protocols with EMT to control cortical hyperexcitability and symptomatic relief. Anxiety and phobia management and integrated psychological support are indispensable dimensions of our care model.

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Frequently Asked Questions

FAQ's about Stiff Man's Disease

What should I expect at the first assessment appointment?
The first consultation includes a detailed anamnesis of the clinical history - evolution of the stiffness, pattern of spasms, triggering factors, associated autoimmune diseases and family history - and a full neurological examination assessing the distribution and intensity of the stiffness.
How is Stiff Man Disease diagnosed?
Diagnosis is based on a combination of clinical signs and examinations. The main criteria are: (1) stiffness in the trunk (back and abdomen) that varies over time and can be painful; (2) muscle spasms triggered by stimuli (sound, touch) or emotions; (3) continuous muscle activity on examination (EMG), even at rest, which improves with diazepam; (4) presence of elevated anti-GAD65 antibodies in the blood or cerebrospinal fluid; and (5) exclusion of other causes. Improvement with drugs such as benzodiazepines also helps to confirm the diagnosis.
Are anxiety and phobias part of the illness or a reaction to suffering?
Both. Even so, the neurobiological component is often underestimated. The dysfunction that causes rigidity and spasms also affects nerve circuits involved in the regulation of fear and anxiety - which explains why anxiety and agoraphobia (intense fear of events or situations where it may be difficult to get help) in SPS are disproportionately severe compared to what is expected in a motor disease. In addition, patients respond partially to pharmacological treatment (benzodiazepines, baclofen) and immunotherapy, and not only to psychotherapy, which demonstrates a biochemical cause and not just a psychological one.
What treatment is available for SPS?
Treatment is carried out on several fronts: (1) therapies that act on the immune system to control the disease; (2) medication to reduce stiffness and spasms; (3) neuromodulation techniques as support; and (4) physical and psychological rehabilitation. The plan is always adapted to each person and adjusted according to the response to treatment.
What role does EMT play in SPS?
A Transcranial Magnetic Stimulation Low-frequency therapy helps to “calm” the brain's activity in the area responsible for movement. This can reduce stiffness and muscle spasms. In people with this disease, it has proven successful in reducing excessive muscle activity, relieving symptoms, and improving quality of life. It is a complementary, non-invasive, safe and well-tolerated treatment, carried out at NeuroPsyque with specialised medical supervision.
What are anti-GAD65 antibodies and why are they important?
GAD65 is a substance in the nervous system that helps produce GABA, an essential chemical for “calming” nerve activity. When there are antibodies against GAD65, this function is compromised, leading to excess nerve activity, which can cause rigidity and spasms. Very high levels of these antibodies are associated with neurological diseases, while lower levels can appear in other conditions, such as type 1 diabetes, and it is important to interpret the results in the clinical context.
Is Stiff Man's Disease progressive? What is the prognosis?
Without treatment, SPS progresses slowly but steadily - with worsening stiffness, increased frequency of spasms, progressive restriction of mobility and a severe deterioration in quality of life. With adequate and early immunotherapy, many patients achieve stabilisation or significant improvement. The prognosis varies greatly depending on the form (type).
Is SPS hereditary? Can it be passed on to my children?
No. Stiff Man Syndrome is an acquired autoimmune disease - it has no direct hereditary pattern. There are certain genetic factors that increase an individual's risk of developing autoimmune diseases in general, but SPS is not transmitted from parent to child in any direct or predictable way. Family members of SPS patients have no significant increased risk of developing the same condition.
Does NeuroPsyque support SPS patients at all stages of the disease?
Yes. We monitor patients from the stage of diagnostic suspicion - often after years of medical pilgrimage without a diagnosis - to medical and functional monitoring in patients with an established diagnosis and under immunotherapy. The assessment consultation is carried out in the speciality of Neurology. Therapeutic management is continually adjusted according to clinical response and serological results (measurement of antibodies in the blood). Contact us to clarify your situation or request a second neurological opinion.