What actually cures a cold?

There is no cure for the common cold — the infection must run its course as the immune system clears the virus. Symptom management is the available option: saline nasal rinses reduce nasal symptoms; analgesics (paracetamol, ibuprofen) address fever and discomfort; decongestants provide short-term nasal relief; and adequate rest, hydration, and warmth support the immune response. Zinc lozenges (taken within 24 hours of symptom onset) have evidence for reducing duration. Vitamin C in supplemental doses modestly reduces duration if taken regularly.

Does vitamin C prevent colds?

Regular vitamin C supplementation does not prevent colds in the general population, but it modestly reduces duration (by about 8% in adults) and severity when taken consistently before and during illness. The exception is people under significant physical stress (marathon runners, military personnel in extreme cold) — in this group, vitamin C supplementation does reduce incidence. High-dose vitamin C at the onset of symptoms is popular but has limited high-quality evidence for additional benefit beyond daily supplementation.

Why do some people get colds much more often than others?

Cold susceptibility is influenced by: immune system health (sleep quality, nutritional status, stress load, and vitamin D levels significantly affect immune resilience); exposure frequency (working with children or in high-contact environments); smoking (which damages respiratory mucosal immunity); and possibly gut microbiome diversity. Psychological stress — particularly sustained social conflict or job stress — has been shown in controlled studies to increase cold susceptibility through immune suppression. Sleep deprivation produces the most potent immune suppression of any commonly measured lifestyle factor.

When should a cold be taken seriously medically?

Most colds resolve within 7–10 days. Seek medical attention for: symptoms lasting more than 10 days without improvement; fever above 39°C or fever returning after initial improvement; severe sinus pain or pain behind the eyes; difficulty breathing or shortness of breath; severe throat pain that makes swallowing impossible; symptoms that significantly worsen after initial improvement (which may indicate secondary bacterial infection); or colds in people who are immunocompromised, pregnant, or have significant underlying respiratory or cardiovascular disease.

Immunelow Risk

Common cold

An upper respiratory tract infection typically caused by viral pathogens.

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Reviewed by Dr. Ciara Magee · Integrative Midwifery26 March 2026Emerging evidence

Quick answer

The common cold is an upper respiratory viral infection causing congestion, sore throat, and fatigue. Zinc, vitamin C, elderberry, and echinacea show variable evidence for reducing severity and duration; rest and hydration remain the most important recovery strategies.

Do any of these feel familiar?

The common cold is most commonly experienced as a gradual onset of nasal congestion, a runny nose, sneezing, and a sore throat — typically peaking around day two or three before resolving over a week to ten days
Mild fatigue, muscle aches, and a low-grade temperature are common in the early stages
Many people describe a foggy-headed feeling and difficulty concentrating
For most, the cold is more of a nuisance than a serious illness, though it can be significantly more disruptive for those with asthma or other respiratory conditions
Repeated colds throughout winter, especially in those with young children or high-contact work environments, are very common

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