Nausea and Vomiting: When to Worry and How to Help Yourself

Introduction: What are Nausea and Vomiting?

Nausea is an unpleasant sensation in the upper abdomen and throat, often accompanied by the urge to vomit. Vomiting, in turn, is the involuntary expulsion of stomach contents through the mouth. These symptoms can occur for a variety of reasons, ranging from relatively harmless to potentially life-threatening conditions. Understanding the potential causes and knowing when to seek medical attention is crucial for maintaining your health.

The Diverse Causes of Nausea and Vomiting

The causes of nausea and vomiting are extremely diverse and can affect various body systems:

• Infectious Diseases

  Viral and bacterial infections are among the most frequent causes. These include intestinal infections, influenza, and acute respiratory viral infections. In the context of the COVID-19 pandemic, although nausea and vomiting were not always primary symptoms, the virus can affect various body systems, including the thyroid gland [1], which in turn can cause discomfort and other systemic manifestations.

  Severe infectious conditions such as sepsis and toxic shock require special attention. Sepsis is a leading cause of mortality among critically ill patients. Toxic shock is a toxin-mediated condition that can affect both women and men, manifesting with fever, hypotension (low blood pressure), rash, and multi-organ dysfunction [2]. In such cases, nausea and vomiting are merely part of a broader and more dangerous clinical picture.

• Neurological Conditions

  The brain plays a central role in regulating nausea and vomiting. Neurological causes include:

  • Migraine: This common neurological disorder is often accompanied by severe headache, photophobia, phonophobia, and very frequently, nausea and vomiting [7].
  • Head Injuries: Traumatic brain injuries (TBIs) and intracranial hemorrhages, especially in critically ill children, can cause nausea and vomiting due to increased intracranial pressure [8].
  • Dizziness: A spinning sensation or instability can be caused by various factors, including vestibular disorders or neurological conditions. Dizziness often provokes nausea. Sometimes it may be associated with neuralgia, for example, following traumatic injury [6].

• Endocrine and Autoimmune Disorders

  Hormonal imbalances and autoimmune processes can significantly affect the digestive system:

  • Thyroid Disorders: Hypothyroidism (decreased function), hyperthyroidism (increased function, e.g., in Graves' disease) [3, 5], and thyroiditis (inflammation of the thyroid gland) [1] can cause a wide range of symptoms, including nausea, vomiting, weight changes, fatigue, and mood disturbances. Studies show that post-traumatic stress disorder (PTSD) may increase the risk of developing Graves' disease [3].
  • Wide Range of Impact from Autoimmune Thyroid Diseases: Autoimmune thyroid diseases (AITD) may be associated with an increased risk of developing other serious conditions, such as gout (in both hypothyroidism and hyperthyroidism) [5], as well as coronary artery disease, chronic obstructive pulmonary disease, depression, diabetic neuropathy, rheumatoid arthritis, and systemic lupus erythematosus [4]. These comorbidities or their treatments may also contribute to the onset of nausea and vomiting.

• Other Possible Causes

  These include food poisoning, side effects of certain medications, pregnancy (morning sickness), motion sickness, severe stress or anxiety, and certain chronic digestive system disorders.

When Do Nausea and Vomiting Require Immediate Medical Attention? (Red Flags)

Although many cases of nausea and vomiting resolve on their own, there are symptoms that require immediate medical attention:

• Signs of Dehydration: Severe thirst, dry mouth, infrequent urination, weakness, dizziness.
• High Body Temperature combined with nausea and vomiting.
• Severe, Unbearable Pain in the abdomen or chest.
• Blood in Vomit (may look like fresh blood or "coffee grounds").
• Symptoms of Sepsis or Toxic Shock: Fever, low blood pressure, rash, confusion, rapid heart rate [2].
• Vomiting After a Head Injury, especially if accompanied by confusion, severe headache, or vision changes [8].
• Prolonged Vomiting: More than 24-48 hours in adults or several hours in infants and young children.
• Inability to Keep Liquids Down for several hours.
• Severe Headache, especially if it differs from usual headaches or is accompanied by nuchal rigidity (stiff neck).

How to Relieve Nausea and Vomiting: First Aid

If nausea and vomiting are not accompanied by "red flags," you can try to relieve the condition at home:

• Rehydration: The most important thing is to prevent dehydration. Drink plain water, mild tea, sports drinks, or special oral rehydration solutions in small sips. Avoid carbonated drinks and high-sugar juices.
• Rest: Avoid sudden movements. Lie down or sit in a comfortable position.
• Diet: After vomiting stops, gradually reintroduce bland foods: crackers, bananas, rice, applesauce. Avoid fatty, spicy, fried foods, dairy products, and caffeine.
• Fresh Air: Open a window or go outside if possible.
• Avoid Triggers: Try to identify and avoid odors, bright lights, or movements that worsen nausea.

Diagnostics and Treatment: The Physician's Approach

When consulting a doctor to determine the causes of nausea and vomiting, a comprehensive approach will be used:

1. Anamnesis and Physical Examination: The doctor will ask about the nature of the symptoms, their duration, concomitant diseases, medications taken, and recent events (e.g., injuries [8] or contact with sick individuals).
2. Laboratory Tests: May include a complete blood count and biochemical blood panel (to assess electrolyte levels, kidney and liver function, and signs of infection), urinalysis, and thyroid hormone tests [1, 3, 5].

3. Instrumental Studies: Depending on the suspected cause, an abdominal ultrasound, X-ray, CT, or MRI may be ordered (e.g., if traumatic brain injury [8] or other neurological problems are suspected).

4. Treatment of the Underlying Cause: Once a diagnosis is established, the doctor will prescribe treatment aimed at eliminating the root cause of nausea and vomiting. This may include antibiotic therapy for bacterial infections [2], migraine medications [7], hormonal correction for thyroid disorders [1, 3, 5], or other specialized methods.

5. Symptomatic Therapy: Antiemetics may be prescribed to relieve symptoms.

Nausea and vomiting are not just unpleasant symptoms, but important bodily signals. Attentiveness to them and timely medical care can help prevent serious complications and protect your health.

Sources

1. COVID-19 and thyroid disease: An infodemiological pilot study. (World journal of methodology, 2022) https://pubmed.ncbi.nlm.nih.gov/35721248/
2. Critical care infectious disease. (Obstetrics and gynecology clinics of North America, 2003) https://pubmed.ncbi.nlm.nih.gov/14719846/
3. Causal effects of post-traumatic stress disorder on autoimmune thyroid disease: insights from mendelian randomization. (Frontiers in psychiatry, 2024) https://pubmed.ncbi.nlm.nih.gov/39371915/
4. Autoimmune thyroid disease and human health: a systematic review of Mendelian randomization studies. (Frontiers in immunology, 2025) https://pubmed.ncbi.nlm.nih.gov/41425574/
5. The causal association between thyroid disease and gout: A Mendelian randomization study. (Medicine, 2023) https://pubmed.ncbi.nlm.nih.gov/37932979/
6. Cryoneurolysis of auriculotemporal nerve for treatment of otalgia. (BMJ case reports, 2026) https://pubmed.ncbi.nlm.nih.gov/42270145/
7. Safety Profile of Zavegepant in the Treatment of Acute Migraine: Insights from the FDA Adverse Event Monitoring System Database. (Pharmaceuticals (Basel, Switzerland), 2026) https://pubmed.ncbi.nlm.nih.gov/42356560/
8. Plasma and Platelet Transfusion Strategies in Critically Ill Children Following Severe Trauma, Traumatic Brain Injury, and/or Intracranial Hemorrhage: From the Transfusion and Anemia EXpertise Initiative-Control/Avoidance of Bleeding. (Pediatric critical care medicine : a journal of the Society of Critical Care Medicine and the World Federation of Pediatric Intensive and Critical Care Societies, 2022) https://pubmed.ncbi.nlm.nih.gov/34989702/

The information presented in this article is for reference purposes only and cannot replace professional medical advice. Always consult a qualified specialist for diagnosis and treatment.