Neurology

Recognizing the Symptoms of MSA-C

At a Glance

Multiple System Atrophy, cerebellar type (MSA-C) is characterized by severe autonomic failure, such as bladder issues and blood pressure drops, combined with coordination problems (ataxia). Early signs often include urinary dysfunction and sleep disturbances before balance issues emerge.

Recognizing the symptoms of Multiple System Atrophy, Cerebellar type (MSA-C) is often a process of connecting dots that may at first seem unrelated. Because MSA-C involves several different systems in the brain and body, symptoms can appear in a “staggered” fashion, making the early stages feel confusing ^[1].

The Diagnostic “Cornerstone”: Autonomic Failure

The most important differentiator between MSA-C and other conditions (like Parkinson’s or standard ataxias) is autonomic failure ^[2]. This refers to the breakdown of the “autopilot” system that controls your internal organs. In MSA-C, these symptoms are often severe and appear early—sometimes years before balance issues begin ^[3].

Urinary Dysfunction: This is often the first sign. It may manifest as urinary retention (difficulty emptying the bladder completely) or incontinence (loss of bladder control) ^[4]. In men, early erectile dysfunction is also a common autonomic signal ^[5].
Orthostatic Hypotension (OH): This is a sharp drop in blood pressure that occurs when you stand up. It can cause dizziness, lightheadedness, or even fainting, but typically improves when you sit or lie down ^[6]^[7].

The “C” in MSA-C: Cerebellar Ataxia

The primary motor symptom of MSA-C is cerebellar ataxia, which stems from the breakdown of the cerebellum, the brain’s “coordination center” ^[1].

Gait Instability: You may feel uncoordinated or “drunk” while walking, even if you haven’t had alcohol ^[1].
Speech Changes: Speech may become slurred, slow, or develop a rhythmic “scanning” quality ^[1].
Fine Motor Issues: Difficulty with precise tasks, such as buttoning a shirt or writing clearly ^[1].

The 2022 MDS Diagnostic Criteria

In 2022, the Movement Disorder Society (MDS) updated the rules for how MSA-C is diagnosed to help doctors catch it earlier and more accurately ^[5]. Under these new guidelines, your doctor will likely categorize your diagnosis into one of two levels:

Category	Requirements
Clinically Established	Requires severe autonomic failure (like significant bladder issues or a major blood pressure drop) AND clear cerebellar ataxia, plus specific MRI findings (like the ‘hot cross bun’ sign) ^[5]^[8].
Clinically Probable	Focuses on the clinical symptoms (balance and autonomic) but is more flexible regarding MRI results. This category is designed to be more “sensitive,” helping patients get a diagnosis sooner ^[5]^[9].

Overlooked Symptoms and “Red Flags”

Beyond balance and bladder issues, MSA-C often includes symptoms that might seem like separate health problems:

REM Sleep Behavior Disorder (RBD): Acting out dreams, shouting, or thrashing during sleep. This is often a very early warning sign of the underlying protein buildup ^[10].
Inspiratory Stridor: A high-pitched, strained whistling sound when breathing in, especially during sleep. This is considered a significant “red flag” for MSA ^[5]^[11].
Cold Hands and Feet: Poor circulation and temperature regulation are common “supportive features” of the disease ^[5].

Why is MSA-C Confused with Other Conditions?

In its early stages, MSA-C can look remarkably like Parkinson’s disease or a group of inherited disorders called Spinocerebellar Ataxias (SCA) ^[12]. However, the severity and early onset of autonomic failure is the key. While Parkinson’s patients may eventually develop some bladder or blood pressure issues, in MSA-C, these problems are typically more profound and occur within the first few years of the disease ^[13]^[5].

Common questions in this guide

What are the first signs of MSA-C?

The earliest signs of MSA-C are often related to autonomic failure, such as urinary retention, incontinence, or erectile dysfunction. These symptoms can appear years before balance and coordination issues begin.

What is cerebellar ataxia in MSA-C?

Cerebellar ataxia is the primary motor symptom in MSA-C, caused by damage to the brain's coordination center. It typically causes uncoordinated walking, slurred speech, and difficulty with precise hand movements.

How is MSA-C different from Parkinson's disease?

While both conditions share some symptoms, MSA-C features severe and early onset autonomic failure, such as significant drops in blood pressure and bladder problems. Parkinson's patients typically develop these issues much later in the disease process.

What are the sleep-related symptoms of MSA-C?

People with MSA-C often experience REM sleep behavior disorder, which involves acting out dreams by shouting or thrashing. Another critical symptom is inspiratory stridor, a high-pitched whistling sound made while breathing in during sleep.

What is the hot cross bun sign?

The "hot cross bun" sign is a specific pattern sometimes seen on brain MRI scans in people with MSA-C. It indicates shrinkage and nerve damage in specific areas of the brainstem, helping doctors confirm a diagnosis.

Curated prompts to bring to your next appointment.

1.Does my autonomic dysfunction—specifically my urinary and blood pressure issues—meet the 'severe' criteria for a Clinically Established diagnosis?
2.Can we check my 'post-void residual' (PVR) volume? Is it above the 100mL threshold often seen in MSA?
3.Did my MRI show the 'hot cross bun' sign or atrophy in the middle cerebellar peduncles (MCP)?
4.Are the breathing sounds I make at night considered 'stridor,' and should we do a sleep study?
5.How do my symptoms help rule out look-alike conditions like Spinocerebellar Ataxia (SCA)?

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References (13)

1
A historical review of multiple system atrophy with a critical appraisal of cellular and animal models.
Marmion DJ, Peelaerts W, Kordower JH
Journal of neural transmission (Vienna, Austria : 1996) 2021; (128(10)):1507-1527 doi:10.1007/s00702-021-02419-8.
PMID: 34613484
2
Autonomic Dysfunction in α-Synucleinopathies.
Mendoza-Velásquez JJ, Flores-Vázquez JF, Barrón-Velázquez E, et al.
Frontiers in neurology 2019; (10()):363 doi:10.3389/fneur.2019.00363.
PMID: 31031694
3
Female Urinary Retention Progressing to Possible Multiple System Atrophy-cerebellar Form after 12 Years.
Sakakibara R, Sekiguchi Y, N Panicker J, et al.
Internal medicine (Tokyo, Japan) 2022; (61(23)):3599-3604 doi:10.2169/internalmedicine.8724-21.
PMID: 35569977
4
Differential value of external anal- and urethral-sphincter electromyography in multiple system atrophy cerebellar type and spinocerebellar ataxias.
Miao Y, Wang K, Han J, et al.
Journal of clinical neuroscience : official journal of the Neurosurgical Society of Australasia 2020; (80()):16-22 doi:10.1016/j.jocn.2020.07.067.
PMID: 33099340
5
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Movement disorders : official journal of the Movement Disorder Society 2022; (37(6)):1131-1148 doi:10.1002/mds.29005.
PMID: 35445419
6
Diagnosing multiple system atrophy at the prodromal stage.
Xia C, Postuma RB
Clinical autonomic research : official journal of the Clinical Autonomic Research Society 2020; (30(3)):197-205 doi:10.1007/s10286-020-00682-5.
PMID: 32232688
7
Prevalence of Supine Hypertension in Alpha-Synucleinopathies: A Systematic Review and Meta-Analysis.
Moss Lopes PR, Westphal Filho FL, Mendes Filho FSM, et al.
Movement disorders clinical practice 2025; (12(11)):1703-1713 doi:10.1002/mdc3.70142.
PMID: 40406920
8
A Review on the Clinical Diagnosis of Multiple System Atrophy.
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PMID: 35986227
9
Validation Study of the MDS Criteria for the Diagnosis of Multiple System Atrophy in the Mayo Clinic Brain Bank.
Sekiya H, Koga S, Murakami A, et al.
Neurology 2023; (101(24)):e2460-e2471 doi:10.1212/WNL.0000000000207905.
PMID: 37816641
10
REM Sleep Behavior Disorder in Parkinson's Disease and Other Synucleinopathies.
St Louis EK, Boeve AR, Boeve BF
Movement disorders : official journal of the Movement Disorder Society 2017; (32(5)):645-658 doi:10.1002/mds.27018.
PMID: 28513079
11
Heightened risk of early vocal fold motion impairment onset and dysphagia in the parkinsonian variant of multiple system atrophy: a comparative study.
Tsuchiya K, Ueha R, Suzuki S, et al.
Clinical parkinsonism & related disorders 2020; (3()):100037 doi:10.1016/j.prdoa.2020.100037.
PMID: 34316623
12
Can Autonomic Testing and Imaging Contribute to the Early Diagnosis of Multiple System Atrophy? A Systematic Review and Recommendations by the Movement Disorder Society Multiple System Atrophy Study Group.
Pellecchia MT, Stankovic I, Fanciulli A, et al.
Movement disorders clinical practice 2020; (7(7)):750-762 doi:10.1002/mdc3.13052.
PMID: 33043073
13
Difference in cardiovascular response during orthostatic stress in Parkinson's disease and multiple system atrophy.
Nakamura T, Suzuki M, Ueda M, et al.
Journal of neural transmission (Vienna, Austria : 1996) 2020; (127(10)):1377-1386 doi:10.1007/s00702-020-02241-8.
PMID: 32783093

This page provides educational information about MSA-C symptoms and diagnostic criteria. It does not replace professional medical advice. Always consult a neurologist for a proper diagnosis and symptom evaluation.

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