It May Not Look Like Sepsis: Spotting Subtle Deterioration in Older and Vulnerable Adults

An older person who is suddenly quieter, more confused, less mobile or passing very little urine may not describe feeling unwell. They may not have a high temperature either. For care assistants, HCAs, nurses and managers, recognising that a person is not their usual self can be the first important clue that they need urgent assessment.

Sepsis is a time-critical condition caused by the body’s dysregulated response to infection, leading to life-threatening organ dysfunction. It can develop from many types of infection, and there is no single simple test that confirms it. Symptoms can overlap with other conditions, which is why subtle deterioration must not be explained away too quickly.[^1]

The direct answer: look for change, not one “classic” sign

Possible sepsis in an older or vulnerable adult may first appear as a change from their normal baseline: new confusion, unusual sleepiness, reduced interaction, altered speech, reduced urine, worsening breathlessness or a rapid drop in everyday function.

A high temperature can be less common in older adults, so its absence does not exclude serious infection or sepsis.[^2] Physiological observations and early warning scores can help identify deterioration where they are used, but they must sit alongside clinical judgement, the person’s baseline, concern from carers and an assessment of possible infection.[^1]

The safe approach is not to try to diagnose sepsis from one sign. Recognise deterioration, consider infection, share the full picture and follow your local escalation pathway without delay.

Why sepsis can be harder to spot in older and vulnerable adults

Older adults have a higher chance of getting sepsis, particularly those aged over 75.[^2] Yet the signs may be less obvious than people expect. A person may present with functional or behavioural change before they can identify, or communicate, a specific symptom.

Recognition can also be more difficult for people living with dementia, a learning disability or communication difficulties.[^2] NHS England highlights unequal sepsis outcomes for several groups, including older people, people with serious mental illness, people experiencing homelessness, and some people with a learning disability or autistic people.[^1]

One reason is diagnostic overshadowing: attributing a new symptom to a person’s existing condition instead of considering a new physical cause. For example:

• New confusion may be assumed to be dementia.
• Withdrawal or reduced communication may be attributed to mental ill health or disability.
• Reduced mobility may be dismissed as frailty or tiredness.
• Difficulty explaining pain or feeling unwell may lead others to underestimate the severity of change.

These explanations may sometimes be relevant, but they should not stop staff considering deterioration, infection and the need for escalation.

Subtle signs that deserve attention

No individual sign confirms sepsis. However, the NHS advises that common symptoms in adults can include confusion or slurred speech, uncontrollable shivering, muscle pain, difficulty breathing, blue, pale, grey or blotchy skin, high or low temperature, and little or no urine.[^2]

In care settings, the earliest concern may be a pattern of smaller changes. Pay attention when there is a new or worsening change such as:

• confusion, disorientation, slurred speech or speech that does not make sense
• unusual drowsiness, agitation, withdrawal or a marked behaviour change
• a significant reduction in eating, drinking, participation or usual mobility
• little or no urine, or a clear change in usual urinary output
• breathing that appears more difficult or faster than usual
• shivering, feeling hot or cold, or an unusually high or low temperature
• pale, grey, blue or blotchy skin colour
• a carer, relative or staff member saying, “They are not themselves.”

That last observation matters. NHS England describes carer concern as a “soft sign” of deterioration in community settings. People who know the individual well are often best placed to notice a meaningful departure from their usual function or behaviour.[^1]

Start with the person’s normal baseline

Baseline information turns a vague concern into useful clinical information. It is particularly valuable when someone cannot reliably explain what they feel or when their usual cognition, communication or mobility differs from others.

When raising a concern, be specific about what has changed. For example:

“Mr Khan is normally chatty, independently walks to the dining room and knows the staff. Since this morning he has stayed in his chair, is answering with single words, appears more breathless when speaking and has passed very little urine.”

This is more useful than simply reporting that the person is “a bit off”. It helps the receiving clinician understand the speed, nature and impact of deterioration.

Useful information to gather and hand over, in line with your role and local procedure, includes:

• when the change was first noticed and whether it is worsening
• the person’s normal cognition, communication, mobility and level of independence
• current observations and any relevant early warning score used locally
• any known or suspected source of infection
• urine output or marked changes in toileting
• recent contacts for the same or a related concern
• relevant risks such as a catheter, line, wound, poor skin integrity, swallowing difficulty, PEG tube, immunosuppression, or recent surgery or invasive procedure.[^1]

Consider possible sources of infection and individual risks

Sepsis can follow any infection. Common sources include chest infections or pneumonia, urinary tract infections, abdominal infections, and skin infections or infected wounds.[^1][^2]

In some people, the context may increase concern. NHS England specifically identifies higher-risk groups and situations including older age, immunosuppression, serious mental illness, indwelling urinary catheters or central lines, compromised skin integrity, and swallowing difficulties or PEG tubes.[^1]

This is not a checklist for diagnosing infection. It is a prompt to ask a better question: could an infection be contributing to this person’s deterioration? A wound, catheter, new cough, reduced urine output or recent procedure may provide relevant context when escalation is needed.

A practical response to suspected deterioration

1. Take the concern seriously

Do not wait for every familiar sepsis symptom to appear. A person with sepsis may not have all listed symptoms.[^2] Treat a clear departure from baseline, particularly when it is worsening, as information that needs action.

2. Assess and observe within your competence and local process

Use the observations, assessment tools and early warning system available in your setting, where relevant. Record what you find accurately. Early warning scores support recognition, but do not replace professional judgement or concern from those who know the person.[^1]

3. Escalate promptly using your local pathway

Share the concern with the appropriate clinician or service and state clearly that you are concerned about deterioration and possible infection. NHS England’s framework emphasises timely recognition, response and escalation to acute services when needed.[^1]

For an adult with signs that may indicate sepsis, the NHS advises calling 999 or going to A&E if they are breathing very fast, confused, have slurred speech or are not making sense, have blue, pale or blotchy skin, have a very high or very low temperature or shivering, have a non-fading rash, or have symptoms that make you worry about sepsis.[^2] Follow local emergency arrangements; do not delay urgent help while waiting for all signs to develop.

4. Hand over the whole story

A safe handover includes the person’s baseline, what has changed, observations, suspected infection source, relevant risks, actions already taken and the response to previous contacts. NHS England also highlights the importance of systems that identify repeated presentations and make previous-contact information available.[^1]

5. Continue to notice and communicate change

If the person’s condition changes while awaiting advice or transfer, communicate this through the appropriate local process. Deterioration is dynamic; a single set of observations or one conversation may not show the whole picture.

Common pitfalls to avoid

Waiting for a fever

Older adults may not develop a high temperature. Do not use the lack of fever as reassurance when there are other concerning changes.[^2]

Explaining away a new change

Dementia, disability, mental ill health and frailty can affect presentation, but they should not become a reason to overlook a new physical deterioration. Guard actively against diagnostic overshadowing.[^1]

Treating a score as the final answer

An early warning score is one part of the picture. It cannot replace a concern about acute change, carer input, assessment for infection or escalation according to local pathways.[^1]

Giving a vague handover

“Not themselves” is a valuable starting point, but add detail. State what the person is normally like, what is different now, when it began and whether it is worsening.

A short checklist for care teams

When a resident or patient seems subtly unwell, ask:

1. What is different from their usual baseline?
2. When did the change begin, and is it getting worse?
3. Could infection be a factor? Consider symptoms, wounds, catheters, devices and recent procedures.
4. Are there concerning signs such as confusion, breathing difficulty, shivering, altered skin colour or reduced urine?
5. What do family members, unpaid carers or colleagues who know the person well think?
6. What observations and local assessment tools are available?
7. Who needs to know now under the local escalation pathway?
8. Has the baseline, concern, action and outcome been recorded and handed over clearly?

Frequently asked questions

Can an older person have sepsis without a fever?

Yes. The NHS states that a high temperature is less common in older adults. Absence of fever should not be used to rule out serious infection or sepsis when there are other concerning changes.[^2]

Is sudden confusion a sign of sepsis?

Confusion or slurred speech can be a symptom of sepsis in adults, but it is not specific to sepsis. Sudden confusion should be taken seriously as deterioration and escalated according to local procedures, particularly when infection is possible.[^2]

What does “not themselves” mean in practice?

It means a meaningful change from the person’s usual cognition, behaviour, communication, mobility or daily function. Describe the change concretely so that others can assess the risk and act appropriately.

Can early warning scores rule out sepsis?

No. NHS England says early warning systems support recognition of deterioration, but they do not replace clinical judgement, carer concern, assessment for infection or escalation pathways.[^1]

Conclusion: recognise the change and share the concern

In older and vulnerable adults, possible sepsis may not look like a textbook emergency at first. The meaningful clue may be a quiet, practical change: less urine, less conversation, reduced mobility, new confusion or breathing that is not normal for that person.

Notice the baseline, listen to those who know the person, consider infection and escalate promptly through your local process. Calm, specific communication can help ensure subtle deterioration is not missed.

For further professional development, discuss how your team records baseline information, responds to soft signs and shares escalation concerns across shifts and care settings.

References

[^1]: NHS England. Sepsis modern service framework.

[^2]: NHS. Sepsis.

Further clinical guidance: NICE NG253: Suspected sepsis in people aged 16 or over: recognition, assessment and early management.