diff --git a/src/components/Sidebar.tsx b/src/components/Sidebar.tsx
new file mode 100644
index 0000000..eb201cb
--- /dev/null
+++ b/src/components/Sidebar.tsx
@@ -0,0 +1,432 @@
+import { AlertTriangle, AlertCircle } from 'lucide-react'
+import { patient } from '@/data/patient'
+import { tags } from '@/data/tags'
+import { alerts } from '@/data/alerts'
+import type { Tag, Alert } from '@/types/pmr'
+
+interface SectionTitleProps {
+  children: React.ReactNode
+}
+
+function SectionTitle({ children }: SectionTitleProps) {
+  return (
+    <div
+      style={{
+        display: 'flex',
+        alignItems: 'center',
+        gap: '6px',
+        fontSize: '10px',
+        fontWeight: 600,
+        textTransform: 'uppercase',
+        letterSpacing: '0.08em',
+        color: 'var(--text-tertiary)',
+        marginBottom: '10px',
+      }}
+    >
+      <span>{children}</span>
+      <div
+        style={{
+          flex: 1,
+          height: '1px',
+          background: 'var(--border-light)',
+        }}
+      />
+    </div>
+  )
+}
+
+interface TagPillProps {
+  tag: Tag
+}
+
+function TagPill({ tag }: TagPillProps) {
+  const styles: Record<Tag['colorVariant'], React.CSSProperties> = {
+    teal: {
+      background: 'var(--accent-light)',
+      color: 'var(--accent)',
+      border: '1px solid var(--accent-border)',
+    },
+    amber: {
+      background: 'var(--amber-light)',
+      color: 'var(--amber)',
+      border: '1px solid var(--amber-border)',
+    },
+    green: {
+      background: 'var(--success-light)',
+      color: 'var(--success)',
+      border: '1px solid var(--success-border)',
+    },
+  }
+
+  return (
+    <span
+      style={{
+        display: 'inline-flex',
+        fontSize: '10.5px',
+        fontWeight: 500,
+        padding: '3px 8px',
+        borderRadius: '4px',
+        lineHeight: 1.3,
+        ...styles[tag.colorVariant],
+      }}
+    >
+      {tag.label}
+    </span>
+  )
+}
+
+interface AlertFlagProps {
+  alert: Alert
+}
+
+function AlertFlag({ alert }: AlertFlagProps) {
+  const Icon = alert.icon === 'AlertTriangle' ? AlertTriangle : AlertCircle
+
+  const styles: Record<Alert['severity'], React.CSSProperties> = {
+    alert: {
+      background: 'var(--alert-light)',
+      color: 'var(--alert)',
+      border: '1px solid var(--alert-border)',
+    },
+    amber: {
+      background: 'var(--amber-light)',
+      color: 'var(--amber)',
+      border: '1px solid var(--amber-border)',
+    },
+  }
+
+  return (
+    <div
+      style={{
+        display: 'flex',
+        alignItems: 'center',
+        gap: '8px',
+        fontSize: '11px',
+        fontWeight: 700,
+        padding: '7px 10px',
+        borderRadius: 'var(--radius-sm)',
+        letterSpacing: '0.02em',
+        ...styles[alert.severity],
+      }}
+    >
+      <div
+        style={{
+          width: '16px',
+          height: '16px',
+          flexShrink: 0,
+          display: 'flex',
+          alignItems: 'center',
+          justifyContent: 'center',
+        }}
+      >
+        <Icon size={14} strokeWidth={2.5} />
+      </div>
+      <span>{alert.message}</span>
+    </div>
+  )
+}
+
+export default function Sidebar() {
+  return (
+    <aside
+      style={{
+        width: 'var(--sidebar-width)',
+        minWidth: 'var(--sidebar-width)',
+        background: 'var(--sidebar-bg)',
+        borderRight: '1px solid var(--border)',
+        overflowY: 'auto',
+        padding: '20px 16px',
+        display: 'flex',
+        flexDirection: 'column',
+        gap: '2px',
+      }}
+      className="pmr-scrollbar"
+    >
+      {/* PersonHeader Section */}
+      <div
+        style={{
+          borderBottom: '2px solid var(--accent)',
+          paddingBottom: '16px',
+          marginBottom: '6px',
+        }}
+      >
+        {/* Avatar */}
+        <div
+          style={{
+            width: '52px',
+            height: '52px',
+            borderRadius: '50%',
+            background: 'linear-gradient(135deg, var(--accent), #0A8080)',
+            display: 'flex',
+            alignItems: 'center',
+            justifyContent: 'center',
+            color: '#FFFFFF',
+            fontSize: '18px',
+            fontWeight: 700,
+            boxShadow: '0 2px 8px rgba(13,110,110,0.25)',
+            marginBottom: '12px',
+          }}
+        >
+          AC
+        </div>
+
+        {/* Name */}
+        <div
+          style={{
+            fontSize: '15px',
+            fontWeight: 700,
+            color: 'var(--text-primary)',
+            letterSpacing: '-0.01em',
+          }}
+        >
+          CHARLWOOD, Andrew
+        </div>
+
+        {/* Title */}
+        <div
+          style={{
+            fontSize: '11.5px',
+            fontFamily: 'Geist Mono, monospace',
+            fontWeight: 400,
+            color: 'var(--text-secondary)',
+            marginTop: '2px',
+          }}
+        >
+          Pharmacy Data Technologist
+        </div>
+
+        {/* Status badge */}
+        <div
+          style={{
+            display: 'inline-flex',
+            alignItems: 'center',
+            gap: '5px',
+            marginTop: '8px',
+            fontSize: '11px',
+            fontWeight: 500,
+            color: 'var(--success)',
+            background: 'var(--success-light)',
+            border: '1px solid var(--success-border)',
+            padding: '3px 9px',
+            borderRadius: '20px',
+          }}
+        >
+          <span
+            style={{
+              width: '6px',
+              height: '6px',
+              borderRadius: '50%',
+              background: 'var(--success)',
+              animation: 'pulse 2s infinite',
+            }}
+          />
+          <span>{patient.badge}</span>
+        </div>
+
+        {/* Details grid */}
+        <div
+          style={{
+            display: 'grid',
+            gridTemplateColumns: '1fr',
+            gap: '6px',
+            marginTop: '12px',
+          }}
+        >
+          {/* GPhC No. */}
+          <div
+            style={{
+              display: 'flex',
+              justifyContent: 'space-between',
+              alignItems: 'center',
+              fontSize: '11.5px',
+              padding: '2px 0',
+            }}
+          >
+            <span style={{ color: 'var(--text-tertiary)', fontWeight: 400 }}>
+              GPhC No.
+            </span>
+            <span
+              style={{
+                color: 'var(--text-primary)',
+                fontWeight: 500,
+                fontFamily: 'Geist Mono, monospace',
+                fontSize: '11px',
+                letterSpacing: '0.12em',
+              }}
+            >
+              {patient.nhsNumber.replace(/\s/g, '')}
+            </span>
+          </div>
+
+          {/* Education */}
+          <div
+            style={{
+              display: 'flex',
+              justifyContent: 'space-between',
+              alignItems: 'center',
+              fontSize: '11.5px',
+              padding: '2px 0',
+            }}
+          >
+            <span style={{ color: 'var(--text-tertiary)', fontWeight: 400 }}>
+              Education
+            </span>
+            <span
+              style={{
+                color: 'var(--text-primary)',
+                fontWeight: 500,
+                textAlign: 'right',
+              }}
+            >
+              {patient.qualification}
+            </span>
+          </div>
+
+          {/* Location */}
+          <div
+            style={{
+              display: 'flex',
+              justifyContent: 'space-between',
+              alignItems: 'center',
+              fontSize: '11.5px',
+              padding: '2px 0',
+            }}
+          >
+            <span style={{ color: 'var(--text-tertiary)', fontWeight: 400 }}>
+              Location
+            </span>
+            <span
+              style={{
+                color: 'var(--text-primary)',
+                fontWeight: 500,
+                textAlign: 'right',
+              }}
+            >
+              {patient.address}
+            </span>
+          </div>
+
+          {/* Phone */}
+          <div
+            style={{
+              display: 'flex',
+              justifyContent: 'space-between',
+              alignItems: 'center',
+              fontSize: '11.5px',
+              padding: '2px 0',
+            }}
+          >
+            <span style={{ color: 'var(--text-tertiary)', fontWeight: 400 }}>
+              Phone
+            </span>
+            <a
+              href={`tel:${patient.phone}`}
+              style={{
+                color: 'var(--accent)',
+                fontWeight: 500,
+                textDecoration: 'none',
+                textAlign: 'right',
+              }}
+              onMouseEnter={(e) =>
+                (e.currentTarget.style.textDecoration = 'underline')
+              }
+              onMouseLeave={(e) =>
+                (e.currentTarget.style.textDecoration = 'none')
+              }
+            >
+              {patient.phone.replace(/(\d{5})(\d{6})/, '$1 $2')}
+            </a>
+          </div>
+
+          {/* Email */}
+          <div
+            style={{
+              display: 'flex',
+              justifyContent: 'space-between',
+              alignItems: 'center',
+              fontSize: '11.5px',
+              padding: '2px 0',
+            }}
+          >
+            <span style={{ color: 'var(--text-tertiary)', fontWeight: 400 }}>
+              Email
+            </span>
+            <a
+              href={`mailto:${patient.email}`}
+              style={{
+                color: 'var(--accent)',
+                fontWeight: 500,
+                textDecoration: 'none',
+                textAlign: 'right',
+              }}
+              onMouseEnter={(e) =>
+                (e.currentTarget.style.textDecoration = 'underline')
+              }
+              onMouseLeave={(e) =>
+                (e.currentTarget.style.textDecoration = 'none')
+              }
+            >
+              {patient.email}
+            </a>
+          </div>
+
+          {/* Registered */}
+          <div
+            style={{
+              display: 'flex',
+              justifyContent: 'space-between',
+              alignItems: 'center',
+              fontSize: '11.5px',
+              padding: '2px 0',
+            }}
+          >
+            <span style={{ color: 'var(--text-tertiary)', fontWeight: 400 }}>
+              Registered
+            </span>
+            <span
+              style={{
+                color: 'var(--text-primary)',
+                fontWeight: 500,
+                textAlign: 'right',
+              }}
+            >
+              {patient.registrationYear}
+            </span>
+          </div>
+        </div>
+      </div>
+
+      {/* Tags Section */}
+      <div style={{ padding: '14px 0 6px' }}>
+        <SectionTitle>Tags</SectionTitle>
+        <div
+          style={{
+            display: 'flex',
+            flexWrap: 'wrap',
+            gap: '5px',
+          }}
+        >
+          {tags.map((tag) => (
+            <TagPill key={tag.label} tag={tag} />
+          ))}
+        </div>
+      </div>
+
+      {/* Alerts / Highlights Section */}
+      <div style={{ padding: '14px 0 6px' }}>
+        <SectionTitle>Alerts / Highlights</SectionTitle>
+        <div
+          style={{
+            display: 'flex',
+            flexDirection: 'column',
+            gap: '6px',
+          }}
+        >
+          {alerts.map((alert, index) => (
+            <AlertFlag key={index} alert={alert} />
+          ))}
+        </div>
+      </div>
+    </aside>
+  )
+}
diff --git a/src/index.css b/src/index.css
index 2c89741..f1f8b24 100644
--- a/src/index.css
+++ b/src/index.css
@@ -232,3 +232,36 @@ body {
 html {
   scroll-behavior: smooth;
 }
+
+/* Pulse animation for status badge dot */
+@keyframes pulse {
+  0%, 100% {
+    opacity: 1;
+  }
+  50% {
+    opacity: 0.4;
+  }
+}
+
+/* Custom scrollbar for sidebar */
+.pmr-scrollbar {
+  scrollbar-width: thin;
+  scrollbar-color: var(--border) transparent;
+}
+
+.pmr-scrollbar::-webkit-scrollbar {
+  width: 4px;
+}
+
+.pmr-scrollbar::-webkit-scrollbar-track {
+  background: transparent;
+}
+
+.pmr-scrollbar::-webkit-scrollbar-thumb {
+  background: var(--border);
+  border-radius: 2px;
+}
+
+.pmr-scrollbar::-webkit-scrollbar-thumb:hover {
+  background: var(--text-tertiary);
+}