Hemophilia A signs and symptoms

Hemophilia A is a life-long bleeding disorder. If you or your child has hemophilia A, your body does not make enough of a clotting protein called Factor VIII. Factor VIII helps your blood form a clot to stop bleeding. Without enough Factor VIII, you may bleed more easily and for longer than usual.

With hemophilia A, bleeding can last longer than normal after an injury, surgery, or dental work. In more severe cases, bleeding can even start inside your body without any clear injury. Knowing the signs and symptoms can help you decide when home treatment is enough, when to call your care team, and when to go straight to the emergency room.

Common signs and symptoms include:

• Easy bruising: Bruises that are larger or deeper than you would expect from minor bumps or everyday activities
• Prolonged bleeding: Bleeding after cuts, dental work, or surgery that lasts longer than usual and is harder to stop
• Joint bleeds: Pain, warmth, swelling, and stiffness that make it hard to move a knee, ankle, elbow, or other joint. In young children, this might look like refusing to use an arm or leg, crawling instead of walking, or favoring one side
• Muscle bleeds: Swelling, tightness, or pain in areas like the calf, thigh, or forearm; you might feel numbness or tingling if swelling presses on nearby nerves
• Nosebleeds: Nosebleeds that start easily and take a long time to stop
• Blood in urine or stool: Urine that looks pink, red, or brown, or stool that is black or bright red
• Heavy menstrual or postpartum bleeding: Very heavy periods or bleeding longer than usual after childbirth or gynecologic procedures

If these symptoms become more frequent or more severe, let your care team know. It may be a sign that your current treatment needs to be adjusted.

Your care team can measure how much Factor VIII is in your blood with a blood test and compare it to normal levels. This helps predict how often you might bleed and how serious your bleeds may be.

Hemophilia A is usually grouped into three levels of severity

• Mild hemophilia A: More than 5% up to about 40 to 50% of normal Factor VIII levels
• Moderate hemophilia A: 1 to 5% of normal Factor VIII levels
• Severe hemophilia A: Less than 1% of normal Factor VIII levels

In general, higher Factor VIII levels tend to mean fewer bleeds and milder symptoms. Lower Factor VIII levels are linked to more frequent bleeds and a higher risk of serious problems, although symptoms can still vary from person to person.

Bleeding in the brain is a medical emergency. It can happen after a head injury or, if you have severe hemophilia, sometimes without a clear injury. It is important to seek emergency care right away if you or your child with hemophilia A has any of the following:

• A severe or unusual headache that does not go away
• Repeated vomiting
• Unusual sleepiness or extreme tiredness
• Sudden changes in behavior or personality
• Double vision
• Sudden weakness or clumsiness
• Trouble walking
• Seizures
• A stiff neck

Any significant head injury in someone with hemophilia A should be taken seriously, even if symptoms seem mild at first.

When someone with hemophilia A starts treatment for the first time, there's about a 30% chance their immune system will create antibodies that work against the treatment. This is known as developing an inhibitor. An inhibitor is an antibody your immune system creates that targets Factor VIII treatment, seeing it as something foreign to the body.

If you develop an inhibitor, your usual Factor VIII medicine may not work as well or may not work at all. With an inhibitor, bleeding becomes harder to control, and joint and muscle pain may increase since bleeds are not fully stopped. Because inhibitors can appear over time, you should be tested for inhibitors at least once a year, or sooner if your treatment suddenly seems less effective.

Hemophilia A treatments aim to raise your Factor VIII to a protective level, stop bleeding quickly when it happens, and prevent long-term joint and muscle damage.

Most treatments work by replacing or mimicking Factor VIII and are used in two main ways:

• Preventive treatment (prophylaxis): Factor VIII (or a medicine that works like Factor VIII) is given on a regular schedule to lower your chance of bleeds. This approach is often used if you have severe hemophilia A and is now considered the standard in many cases
• On-demand treatment: Factor VIII is given only when you have a bleed or just before planned procedures such as dental work or surgery. It can stop a bleed once it starts, but does not provide continuous protection between doses. Because on-demand treatment only raises your Factor VIII level after a bleed has already started, it can leave you unprotected between bleeds, which is why many people now use preventive treatment as their main approach

Newer extended half-life Factor VIII products stay in your body longer, so you may need fewer infusions while keeping your factor levels in a protective range. There are also medicines that mimic the function of Factor VIII and help your blood clot in a similar way; many of these can be given as injections under the skin instead of through a vein. These newer options can offer more consistent protection and may make it easier for you to stick with a long-term treatment plan.

Even on preventive treatment, you may still have “breakthrough” bleeds or other symptoms. Tell your healthcare provider if you notice more frequent bleeds, new or worsening joint pain or swelling, or bleeds that tend to happen just before your next scheduled dose. Problems fitting your treatment into everyday life, such as frequent missed doses, are also important to discuss.

Breakthrough bleeding while you are on regular preventive therapy may mean your current plan is not giving enough protection throughout the dosing interval. Your care team may review your bleed history, check how your body processes the medicine, talk with you about your daily routine and goals, and then decide whether to adjust the dose, timing, or type of treatment. If you have an inhibitor, special treatments such as bypassing agents or newer therapies may be needed.

Acquired hemophilia A is a separate, rare condition that is not inherited and usually occurs in adults who previously had normal clotting. In acquired hemophilia A, your immune system suddenly starts making antibodies that attack your own Factor VIII. There is usually no family history of acquired hemophilia, and bleeding can be severe and unexpected.2,4 Joint bleeds are less common in acquired hemophilia A.

In acquired hemophilia A, you may notice:

• Large bruises or painful lumps under the skin
• Muscle bleeds
• Gastrointestinal bleeding (such as blood in your stool)
• Genitourinary bleeding (such as blood in your urine)

Bleeding into soft tissues can progress quickly and may damage muscles, nerves, and blood vessels if it is not treated right away.

Because acquired hemophilia A can be life-threatening and hard to recognize, any sudden, severe, or unexplained bleeding in an adult with no prior bleeding history should be evaluated urgently.

Your Factor VIII level is closely linked to how often you bleed and how severe your symptoms are. Regular monitoring and the right treatment can keep your factor levels high enough to protect you from serious bleeds. Preventive treatment can greatly reduce joint damage and improve long-term outcomes, especially if you have severe hemophilia A.

If you are still bleeding often, speak up—your treatment plan may need to be adjusted. Yearly inhibitor testing is important, and care at a comprehensive hemophilia treatment center gives you access to the latest therapies and specialized expertise.