Physical symptoms of anxiety: shortness of breath, palpitations, dizziness and IBS

Why does anxiety cause real physical symptoms?

Anxiety causes real physical symptoms, and the physical symptoms of anxiety are neither imaginary nor put on. The NHS (the UK's National Health Service) explains that when you feel anxious or scared, your body releases stress hormones such as adrenaline and cortisol, so your heart beats faster and you sweat more, and it can go as far as a full panic attack. That is why your ECG and blood tests can be completely normal while your body tells you the opposite: the system itself is healthy, but the way it is running has changed.

Put simply, your brain reads the situation as danger and gets your body ready to fight or run: your heart pumps faster, your breathing speeds up, your muscles tense and your digestive system changes its activity. This system is useful against a real, short-lived danger, but when it stays switched on for weeks and months with no clear danger, it turns into an everyday physical complaint: a tight chest, a breath that never feels full, a stomach that won't settle.

And you are not alone. The World Health Organization (WHO) says anxiety disorders are the most common mental disorders in the world, that 470 million people were living with them in 2023, and estimates that about 5.8% of the world's population currently lives with one. It adds that only about one in four people who need treatment (27.6%) receive any treatment at all.

The most common physical symptoms of anxiety

Symptoms vary from person to person, and you won't necessarily have all of them. These are the most common, as described by the NHS, the WHO, the US National Institute of Mental Health (NIMH) and Cleveland Clinic:

• Heart palpitations: a feeling that your heart is beating faster, harder or irregularly
• Chest pain or tightness: often a sharp, continuous pain triggered by anxiety or a stressful situation
• Shortness of breath: a feeling that you can't get enough air, or fast breathing
• Dizziness and light-headedness, sometimes to the point of feeling you might faint
• Numbness or tingling in the fingers, the arms, or around the mouth and lips
• Sweating and trembling or shaking
• Stomach and bowel upset: nausea, cramps, bloating, indigestion, loss of appetite, diarrhea or constipation
• Feeling hot, with a sense of heat through your body
• Headaches, muscle aches and tension
• Difficulty swallowing
• Needing the toilet more often
• Tiredness and trouble falling or staying asleep

These symptoms can come in waves with stressful situations, or become a constant background to every day. Importantly, many people don't feel anxious at all; they just feel physically unwell, and so they begin a long journey between cardiology, internal medicine and gastroenterology clinics.

Shortness of breath, dizziness and numbness: what exactly is happening?

A well-known explanation for this trio is overbreathing (hyperventilation). When you're anxious, your breathing speeds up and deepens without you noticing, which changes the balance of gases in your blood. Cleveland Clinic explains that this causes numbness and tingling in the arms or around the mouth, dizziness and light-headedness, chest pain, a feeling of breathlessness and a fast, pounding heartbeat, and it can even lead to spasms in the hands and feet.

Importantly, Cleveland Clinic stresses that hyperventilation itself is not harmful, even though an episode is frightening, and that about half of people with panic disorder have hyperventilation syndrome. Its main treatment is reassurance and breathing retraining: slow breathing from the belly (the diaphragm) instead of the chest.

If these symptoms arrive in a sudden wave that peaks quickly, it may be a panic attack. The NHS says a panic attack usually lasts between 5 and 20 minutes, and that it is frightening but not dangerous and should not harm you. Read more in panic attacks and how they differ from a heart attack.

Anxiety and IBS: how are they connected?

Irritable bowel syndrome (IBS) and anxiety often go hand in hand. The US National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) says its most common symptoms are belly pain, often related to bowel movements, along with changes in how your stools look and how often you go, bloating, and a feeling that you haven't finished a bowel movement.

The same institute explains that doctors aren't sure what causes IBS, and that possible factors include problems with communication between the brain and the gut: signals that make food move faster or slower than it should, or that make a normal amount of gas cause real pain. It adds that anxiety, depression and somatic symptom disorder are more common in people with IBS, and that difficult childhood events may be linked to it.

In daily life the two can feed each other: anxiety may play a part in gut symptoms, and repeated belly pain adds to the worry and occupies your thoughts all day. The reassuring news, according to the institute, is that although IBS can hurt, it does not cause other diseases or harm your digestive tract.

Why do physical causes need to be ruled out first?

Accepting that the cause is psychological doesn't mean skipping the doctor. NIMH explains that a doctor may carry out a physical exam to make sure another physical problem isn't causing the symptoms. The NHS advises you not to diagnose yourself but to speak to a doctor if you're worried; chest pain, for example, can come from the heart, the lungs or the digestive system, and only a doctor can tell them apart.

The practical rule: one good, early check-up is better than ten scattered tests over the years. Describe all your symptoms to the doctor once and in order, and mention your stress openly: it is part of the picture, not something to hide. Let the doctor decide which tests are needed, then stick to that without adding extras of your own.

Why do repeated tests and ER visits make things worse?

After the doctor's reassurance, many people start a new chapter: another test with another doctor, an ECG every month, an ER trip with every flutter. Among the signs of health anxiety, the NHS lists constantly checking your body for signs of illness, always asking people to reassure you that you're not ill, and worrying that your doctor or tests may have missed something.

The NHS also points out that anxiety can cause symptoms such as headaches and a racing heart, which you may mistake for signs of illness. And so the loop closes: symptom, fear, test, brief reassurance, fresh doubt, stronger symptom. Each test relieves you for a while, then reinforces the very idea that is hurting you: that something serious in your body needs more investigating. That is why the NHS suggests keeping a record of how often you check your body, ask for reassurance or look up health information, and then gradually cutting down.

Breaking the cycle doesn't come from one final, decisive test, but from changing how you respond to the symptom itself. If you recognize yourself in this loop, read health anxiety and the fear of death, which explains the behaviors that seem reassuring but actually fuel the anxiety.

How do doctors know the cause is psychological?

No test can prove that a symptom is "psychological". The doctor relies on your whole story: when and where the symptoms start, how they relate to situations and stress, what they feel like and how long they last, the results of any tests already done, and whether anxiety, depression, insomnia or panic attacks come with them.

The American Psychiatric Association (APA) makes an important point: the lack of a medical explanation is not, on its own, enough to diagnose somatic symptom disorder. The diagnosis rests on a physical symptom that is distressing or disrupts daily life, together with excessive thoughts, feelings or behaviors about it: constant worry about your health, thoughts out of proportion to how serious the symptom is, or huge amounts of time and energy spent on it. At least one symptom is constantly present, even if the symptoms change or come and go.

The APA also stresses that the person is genuinely suffering and believes they are ill, and is not faking it. That is the difference between the "it's all in your head" many people hear and a respectful diagnosis of a recognized, treatable condition.

Treating the physical symptoms of anxiety: what actually works?

The good news is that effective treatments exist. The WHO describes psychological interventions as essential treatments for anxiety disorders, and says that those with the strongest evidence are based on the principles of cognitive behavioral therapy (CBT).

• Cognitive behavioral therapy (CBT): helps you catch the thought that comes just before the symptom ("this fluttering is the start of a heart attack"), test it against reality, and gradually cut down on checking and reassurance-seeking. NIMH calls it the "gold standard" psychotherapy for generalized anxiety disorder.
• Breathing retraining: Cleveland Clinic explains that breathing from the belly rather than the chest slows your breathing and can help stop or prevent episodes of overbreathing. It is a skill you can learn with your therapist's guidance.
• Medication when needed: the WHO notes that antidepressants called selective serotonin reuptake inhibitors (SSRIs) may help treat anxiety disorders in adults. NIMH explains that they can take several weeks to start working, so don't judge them after a few days.
• Sedatives are not a lasting solution: the WHO cautions that benzodiazepines are generally not recommended for anxiety disorders because of their high potential for dependence and their limited long-term benefit. If you already take one, don't stop it or cut it down on your own: the US Food and Drug Administration (FDA) warns that stopping suddenly or reducing too quickly can cause serious withdrawal reactions, including life-threatening seizures, so your doctor plans any reduction gradually. More in benzodiazepine and sleeping-pill dependence.
• Regular follow-up with one doctor you trust: the APA notes that regular visits with a trusted health professional are a core part of treatment: the doctor offers support, monitors your health and symptoms, and helps you avoid unnecessary tests and treatments.

Never start or stop a medicine, or change what your doctor prescribed, on your own; that decision belongs to a doctor after a full assessment. At Oxygen Center, the path starts with an appointment with a psychiatrist, which tells anxiety apart from other conditions and sets the plan, followed by regular therapy sessions that work on thoughts and behavior, with medication when needed and follow-up until the symptoms settle and you get back to your life.

When to get help: moving from the cardiologist to a psychiatrist

The NHS's rule is simple: see a doctor if anxiety, fear or panic is becoming hard to cope with, or if the self-help steps you've tried haven't worked. NIMH adds that anxiety which persists and gets in the way of everyday life may be an anxiety disorder that needs treatment.

These are practical signs that it's time to move from the cardiologist or internist to a psychiatrist:

• The tests your doctor ordered are done and came back normal, but your symptoms haven't changed
• You keep going back to the ER or switching doctors in search of a different diagnosis
• You've started avoiding places, exercise, travel or driving for fear the symptoms will return
• The symptoms are getting in the way of your work, studies, sleep or family relationships
• They come with repeated panic attacks or a constant fear of dying or of a serious illness
• You've started turning to sedatives, alcohol or any other substance to calm yourself down. Tell your doctor honestly and don't stop suddenly on your own after regular use: MedlinePlus warns that alcohol withdrawal may quickly become life-threatening, the FDA warns of the same with benzodiazepine sedatives, and stopping needs medical supervision

Seeing a psychiatrist doesn't mean "it's all in your head", that you're abandoning your first doctor, or that what you feel isn't real. It is simply the next step once the physical check-up has answered its question. The WHO notes that effective treatments for anxiety disorders exist, yet only about one in four people who need treatment receive any. Taking the first step is what brings that help within your reach.

If you're ready to take that step, or want to ask about someone you love, contact us at any time, 24 hours a day.