Staphylococcus aureus, commonly known as staph bacteria, is a major cause of infections ranging from mild skin conditions to severe, life-threatening diseases1 . About 30% of people carry staph bacteria on their skin or in their noses without symptoms, but these bacteria can cause infections when they enter the body through cuts or wounds2 . Staph infections most often affect the skin but can spread to other parts of the body, leading to serious complications if untreated3 .
Skin-Related Staph Symptoms
Staph bacteria commonly cause skin and soft tissue infections by invading through breaks in the skin such as cuts or scrapes4 . These infections vary widely in severity, from superficial redness and swelling to deep, painful infections that may require medical intervention5 .
Boils
Boils, also called furuncles, are painful, fluid-filled lumps that form around hair follicles due to staph infection1 . These lumps often develop pus and may break open, draining fluid1 . Boils typically appear on the face, neck, armpits, and thighs1 . When multiple boils cluster together, they form carbuncles, which are often found on the back or the nape of the neck1 . Treatment may involve warm compresses or surgical drainage for larger boils1 .
Wound Infection
Staph bacteria frequently infect wounds or surgical sites, leading to inflammation and pus formation1 . These infections can cause redness, swelling, and pain around the wound4 . Treatment may require antibiotics and surgical debridement, which involves cleaning the wound and removing infected tissue1 .
Cellulitis
Cellulitis is a deeper skin infection caused by staph bacteria that results in redness, swelling, warmth, and pain in the affected area6 . It often begins as a small area of tenderness and can spread rapidly if untreated7 . People with weakened immune systems or chronic conditions like diabetes are at higher risk for cellulitis7 .
Impetigo
Impetigo is a contagious bacterial skin infection common in children, caused by staph bacteria8 . It presents as fluid-filled blisters or sores that rupture and leave a yellow or brown crust, usually on exposed areas like the face8 . Impetigo generally does not cause systemic symptoms but requires treatment to prevent spread8 .
Scalded Skin Syndrome
Staphylococcal scalded skin syndrome (SSSS) is a severe skin condition caused by staph toxins, leading to widespread skin peeling resembling a burn9 . It mainly affects infants and young children but can occur in adults with weakened immune systems9 . This syndrome requires prompt medical care.
Folliculitis
Folliculitis is an infection of the hair follicles by staph bacteria, causing small, pus-filled bumps that resemble pimples1 . These lesions are usually red, swollen, and tender6 . Folliculitis is generally mild but can progress to more serious infections if untreated1 .
Staph skin infections often start in areas where the skin is already damaged. They can range from small pimples to large, painful boils and may require antibiotics or surgical drainage. Good hygiene and wound care are essential to prevent these infections1 7.
Gastrointestinal Staph Symptoms
Staph bacteria can cause food poisoning by producing toxins in contaminated food1 . Symptoms usually begin quickly, often within 30 minutes to a few hours after eating, and include stomach pain, cramping, nausea, vomiting, and diarrhea1 . These symptoms typically last several hours to a few days and do not require antibiotics since the illness is toxin-mediated1 .
Bloodstream Infection Symptoms
When staph bacteria enter the bloodstream, they can cause bacteremia, a serious condition that may lead to sepsis1 . Symptoms of bloodstream infection include fever, chills, rapid breathing, fast heart rate, confusion, and cold or sweaty skin10 . Bloodstream infections require urgent medical treatment with intravenous antibiotics to prevent life-threatening complications11 .
Breast Infection Symptoms
Staph infections can affect breast tissue, especially in breastfeeding women, causing mastitis characterized by pain, swelling, and redness10 . If the infection spreads to the bloodstream, it may cause bacteremia and sepsis, a dangerous whole-body inflammatory response1 . Sepsis symptoms include body aches, chills, shivering, and feeling very cold1 . Immediate medical attention is necessary for sepsis.
Bone and Joint Infections
Staph bacteria can infect bones, causing osteomyelitis, a serious and sometimes chronic infection1 . The bacteria colonize bone layers, triggering immune responses that result in swelling, warmth, and dull pain at the infection site1 . Risk factors include artificial joints, recent surgery, chronic diseases, and blood infections1 . Fatigue and lack of energy are common systemic symptoms1 .
Staph can also infect joints, causing septic arthritis. This leads to joint inflammation, swelling, stiffness, and severe pain1 . Septic arthritis is a medical emergency because it can cause permanent joint damage if untreated8 .
- Signs of bone and joint infections include:
- Swelling and warmth at the affected site1
- Dull or severe pain, sometimes worsened by movement1
- Fatigue or low energy1
- Joint stiffness and limited mobility in septic arthritis1
Respiratory Staph Symptoms
Staph bacteria can infect the lungs, causing staphylococcal pneumonia, a severe lung infection often linked to methicillin-resistant Staphylococcus aureus (MRSA) strains1 . This infection leads to inflammation of lung tissue, causing symptoms such as high fever, chills, cough, chest pain, and difficulty breathing1 . Pneumonia caused by staph requires prompt antibiotic treatment and sometimes hospitalization1 .
Heart-Related Staph Symptoms
Staph bacteria can cause infective endocarditis, an infection of the inner lining of the heart chambers and valves12 . This serious condition leads to inflammation, damage to heart valves, and systemic symptoms such as fever, sweating, weight loss, and rapid heartbeat12 . Complications include arrhythmias, systemic emboli, and organ damage12 . Skin signs like painful red lesions (Osler nodes) or painless red spots on palms and soles (Janeway lesions) may also appear12 .
- Infective endocarditis symptoms include:
- Fever and chills12
- Rapid or irregular heartbeat12
- Musculoskeletal pain12
- Peripheral edema (swelling) 12
- Osler nodes and Janeway lesions on the skin12
Toxic Shock Syndrome Signs
Toxic shock syndrome (TSS) is a rare but life-threatening condition caused by toxins from staph bacteria1 . It triggers a sudden and extreme immune response affecting multiple organs1 . Symptoms include a high fever, muscle aches, confusion, diarrhea, vomiting, and a sunburn-like rash1 . A sudden drop in blood pressure is a hallmark of severe TSS and requires immediate emergency care1 .
Pediatric Staph Symptoms
Children, especially infants, are at higher risk for staph infections due to immature immune systems8 . Common skin infections in children include impetigo, which presents as fluid-filled blisters that rupture and form crusts8 . Severe infections like toxic shock syndrome and staphylococcal scalded skin syndrome are more common in pediatric populations and require urgent treatment8 .
When to Seek Medical Care
Most staph infections resolve without treatment as the immune system fights the bacteria1 . However, medical care is necessary if symptoms worsen or complications develop1 . Contact a healthcare provider if you notice pus-filled blisters, fever, or spreading redness1 . Emergency care is critical for signs of severe infection such as:
- High fever or chills1
- Confusion or lack of responsiveness1
- Rapid or irregular heartbeat1
- Persistent swelling or redness1
Early diagnosis and treatment can prevent serious complications like sepsis, pneumonia, or endocarditis1 .
Key Symptom Summary
- Staph infections most commonly affect the skin, causing redness, swelling, pain, and pus-filled lesions5 .
- Food poisoning from staph toxins causes rapid-onset nausea, vomiting, and diarrhea1 .
- Bloodstream infections present with fever, chills, and confusion and can lead to sepsis10 .
- Bone and joint infections cause localized pain, swelling, and fatigue1 .
- Heart infections may cause fever, rapid heartbeat, and skin lesions like Osler nodes12 .
- Toxic shock syndrome is a medical emergency with high fever, rash, and low blood pressure1 .
“If your staph is resistant to the treatments you use, you may develop MRSA. MRSA is a significant concern in both community and health care settings, as it can cause serious and potentially life-threatening infections that are challenging to control.”
— Stephanie S. Gardner, WebMD10
Frequently Asked Questions
What causes staph infections?
Staph infections are caused by Staphylococcus bacteria, which commonly live on the skin or in the nose without causing harm. Infection occurs when bacteria enter through cuts or wounds1 .
What are common signs of a staph skin infection?
Typical signs include painful, red, swollen areas on the skin, pus-filled blisters or boils, and sometimes fever and chills1 .
Can staph infections be serious?
Yes, if staph bacteria spread to the bloodstream, bones, lungs, or heart, they can cause severe, life-threatening infections requiring immediate medical attention1 .
How are staph infections treated?
Treatment depends on the infection type and severity and may include antibiotics, surgical drainage, or supportive care3 .
